feat: Force .env file settings over real environment variable values [COG-1333] (#537)

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## Description
Force .env file settings over real environment variable values

## 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


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Chores**
- Refined configuration handling so that settings from your
configuration file reliably take precedence over existing values,
ensuring a smoother and more predictable experience.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

cognee/__init__.py

@@ -15,6 +15,6 @@ from .modules import pipelines
 try:
     import dotenv
 
-    dotenv.load_dotenv()
+    dotenv.load_dotenv(override=True)
 except ImportError:
     pass