fix: remove redundant uv venv step in CI setup action

uv sync --frozen already creates the .venv; calling uv venv again
fails with "virtual environment already exists". source activate also
has no effect between steps — uv run handles venv activation itself.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Udayraj123

.github/actions/setup-python-with-uv/action.yml

@@ -22,8 +22,3 @@ runs:
       run: uv sync --frozen
       shell: bash
 
-    - name: Activate venv
-      run: |
-        uv venv
-        source .venv/bin/activate
-      shell: bash