fix: Clear pip cache in CI to ensure fresh PyPI index

- Add pip cache purge before installing dependencies
- Use --no-cache-dir flag to force fresh package downloads
- This ensures CI can find recently published packages like divine-requests 0.1.14

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: codebydivine

.github/workflows/ci.yml

@@ -37,7 +37,8 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install -e ".[dev]"
+        pip cache purge
+        pip install --no-cache-dir -e ".[dev]"
 
     - name: Run tests with pytest
       run: |
@@ -79,7 +80,8 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install -e ".[dev]"
+        pip cache purge
+        pip install --no-cache-dir -e ".[dev]"
 
     - name: Run ruff linter
       run: |