fix: Resolve pydantic issue regarding deprecation (#1508)

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## Description
Fix latest pydantic version issues

## Type of Change
<!-- Please check the relevant option -->
- [ ] Bug fix (non-breaking change that fixes an issue)
- [ ] New feature (non-breaking change that adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update
- [ ] Code refactoring
- [ ] Performance improvement
- [ ] Other (please specify):

## Screenshots/Videos (if applicable)
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## Pre-submission Checklist
<!-- Please check all boxes that apply before submitting your PR -->
- [ ] **I have tested my changes thoroughly before submitting this PR**
- [ ] **This PR contains minimal changes necessary to address the
issue/feature**
- [ ] My code follows the project's coding standards and style
guidelines
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have added necessary documentation (if applicable)
- [ ] All new and existing tests pass
- [ ] I have searched existing PRs to ensure this change hasn't been
submitted already
- [ ] I have linked any relevant issues in the description
- [ ] My commits have clear and descriptive messages

## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin.

cognee/infrastructure/databases/graph/config.py

@@ -50,26 +50,26 @@ class GraphConfig(BaseSettings):
     # Model validator updates graph_filename and path dynamically after class creation based on current database provider
     # If no specific graph_filename or path are provided
     @pydantic.model_validator(mode="after")
-    def fill_derived(cls, values):
-        provider = values.graph_database_provider.lower()
+    def fill_derived(self):
+        provider = self.graph_database_provider.lower()
         base_config = get_base_config()
 
         # Set default filename if no filename is provided
-        if not values.graph_filename:
-            values.graph_filename = f"cognee_graph_{provider}"
+        if not self.graph_filename:
+            self.graph_filename = f"cognee_graph_{provider}"
 
         # Handle graph file path
-        if values.graph_file_path:
+        if self.graph_file_path:
             # Check if absolute path is provided
-            values.graph_file_path = ensure_absolute_path(
-                os.path.join(values.graph_file_path, values.graph_filename)
+            self.graph_file_path = ensure_absolute_path(
+                os.path.join(self.graph_file_path, self.graph_filename)
             )
         else:
             # Default path
             databases_directory_path = os.path.join(base_config.system_root_directory, "databases")
-            values.graph_file_path = os.path.join(databases_directory_path, values.graph_filename)
+            self.graph_file_path = os.path.join(databases_directory_path, self.graph_filename)
 
-        return values
+        return self
 
     def to_dict(self) -> dict:
         """

cognee/infrastructure/databases/relational/config.py

@@ -23,14 +23,14 @@ class RelationalConfig(BaseSettings):
     model_config = SettingsConfigDict(env_file=".env", extra="allow")
 
     @pydantic.model_validator(mode="after")
-    def fill_derived(cls, values):
+    def fill_derived(self):
         # Set file path based on graph database provider if no file path is provided
-        if not values.db_path:
+        if not self.db_path:
             base_config = get_base_config()
             databases_directory_path = os.path.join(base_config.system_root_directory, "databases")
-            values.db_path = databases_directory_path
+            self.db_path = databases_directory_path
 
-        return values
+        return self
 
     def to_dict(self) -> dict:
         """

cognee/infrastructure/databases/vector/config.py

@@ -30,21 +30,21 @@ class VectorConfig(BaseSettings):
     model_config = SettingsConfigDict(env_file=".env", extra="allow")
 
     @pydantic.model_validator(mode="after")
-    def validate_paths(cls, values):
+    def validate_paths(self):
         base_config = get_base_config()
 
         # If vector_db_url is provided and is not a path skip checking if path is absolute (as it can also be a url)
-        if values.vector_db_url and Path(values.vector_db_url).exists():
+        if self.vector_db_url and Path(self.vector_db_url).exists():
             # Relative path to absolute
-            values.vector_db_url = ensure_absolute_path(
-                values.vector_db_url,
+            self.vector_db_url = ensure_absolute_path(
+                self.vector_db_url,
             )
-        elif not values.vector_db_url:
+        elif not self.vector_db_url:
             # Default path
             databases_directory_path = os.path.join(base_config.system_root_directory, "databases")
-            values.vector_db_url = os.path.join(databases_directory_path, "cognee.lancedb")
+            self.vector_db_url = os.path.join(databases_directory_path, "cognee.lancedb")
 
-        return values
+        return self
 
     def to_dict(self) -> dict:
         """