Bump python-dotenv from 1.1.1 to 1.2.2 in /src/backend

Bumps [python-dotenv](https://github.com/theskumar/python-dotenv) from 1.1.1 to 1.2.2.
- [Release notes](https://github.com/theskumar/python-dotenv/releases)
- [Changelog](https://github.com/theskumar/python-dotenv/blob/main/CHANGELOG.md)
- [Commits](theskumar/python-dotenv@v1.1.1...v1.2.2)

---
updated-dependencies:
- dependency-name: python-dotenv
  dependency-version: 1.2.2
  dependency-type: direct:production
...

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Author: dependabot[bot]

src/backend/pyproject.toml

@@ -21,7 +21,7 @@ dependencies = [
     "opentelemetry-instrumentation-fastapi==0.60b0",
     "opentelemetry-instrumentation-openai==0.46.2",
     "opentelemetry-sdk==1.39.0",
-    "python-dotenv==1.1.1",
+    "python-dotenv==1.2.2",
     "python-multipart==0.0.22",
     "uvicorn==0.35.0",
     "pylint-pydantic==0.3.5",

src/backend/requirements.txt

@@ -4,7 +4,7 @@ azure-cosmos==4.9.0
 azure-monitor-opentelemetry==1.8.5
 azure-monitor-events-extension==0.1.0
 azure-identity==1.24.0
-python-dotenv==1.1.1
+python-dotenv==1.2.2
 python-multipart==0.0.22
 opentelemetry-api==1.39.0
 opentelemetry-sdk==1.39.0