Fix: Fixes temporal graph ci/cd (#1410)

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## Description
This PR adds default values and descriptions to the Timestamp pydantic
object used in temporal graph.

## Type of Change
<!-- Please check the relevant option -->
- [x] 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
- [x] Code refactoring
- [ ] Performance improvement
- [ ] Other (please specify):

## Changes Made
<!-- List the specific changes made in this PR -->
Adds default value and description to Timestamp pydantic object

## Testing
Tested it manually, althought I was unable to reproduce the issue
(therefore is probably a rare event), but based on the ci/cd logs I
fixed the cause.

## Screenshots/Videos (if applicable)
None

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

## Related Issues
None

## Additional Notes
None

## 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/tasks/temporal_graph/models.py

@@ -3,12 +3,17 @@ from pydantic import BaseModel, Field
 
 
 class Timestamp(BaseModel):
-    year: int = Field(..., ge=1, le=9999)
-    month: int = Field(..., ge=1, le=12)
-    day: int = Field(..., ge=1, le=31)
-    hour: int = Field(..., ge=0, le=23)
-    minute: int = Field(..., ge=0, le=59)
-    second: int = Field(..., ge=0, le=59)
+    year: int = Field(
+        ...,
+        ge=1,
+        le=9999,
+        description="Always required. If only a year is known, use it.",
+    )
+    month: int = Field(1, ge=1, le=12, description="If unknown, default to 1")
+    day: int = Field(1, ge=1, le=31, description="If unknown, default to 1")
+    hour: int = Field(0, ge=0, le=23, description="If unknown, default to 0")
+    minute: int = Field(0, ge=0, le=59, description="If unknown, default to 0")
+    second: int = Field(0, ge=0, le=59, description="If unknown, default to 0")
 
 
 class Interval(BaseModel):