fix: Correct uv installation PATH in CI workflow

The uv installer puts the binary in ~/.local/bin but the workflow was
adding ~/.cargo/bin to PATH, causing 'uv: command not found' errors.

Fixed bootstrap E2E tests failing on Python 3.10 and 3.11.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.github/workflows/tests.yml

@@ -65,7 +65,7 @@ jobs:
     - name: Install uv
       run: |
         curl -LsSf https://astral.sh/uv/install.sh | sh
-        echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+        echo "$HOME/.local/bin" >> $GITHUB_PATH
 
     - name: Cache pip packages
       uses: actions/cache@v3