Add security CI workflows (#248)

* Add security CI workflows

* Remove duplicate Python CodeQL workflow

.github/workflows/codeql.yml

@@ -0,0 +1,34 @@
+name: CodeQL
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    - cron: '37 9 * * 1'
+
+permissions:
+  security-events: write
+  contents: read
+  actions: read
+
+jobs:
+  analyze:
+    name: Analyze (actions)
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v4
+        with:
+          languages: actions
+          build-mode: none
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v4
+        with:
+          category: /language:actions

.github/workflows/dependency-review.yml

@@ -0,0 +1,22 @@
+name: Dependency Review
+
+on:
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  dependency-review:
+    name: Dependency Review
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Dependency Review
+        uses: actions/dependency-review-action@v4
+        with:
+          fail-on-severity: moderate

requirements.txt

@@ -1,6 +1,6 @@
-litellm==1.83.0
+litellm==1.83.7
 # openai-agents  # optional: required for examples/agentic_vectorless_rag_demo.py
 pymupdf==1.26.4
 PyPDF2==3.0.1
-python-dotenv==1.1.0
+python-dotenv==1.2.2
 pyyaml==6.0.2