[DEVOPS-584] no need to check python version: pixi manages it all

Author: sebhmg

.github/actions/reusable-python-setup_pixi/action.yml

@@ -21,10 +21,6 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - name: Get full Python version
-      id: full-python-version
-      shell: bash
-      run: echo "version=$(python -c "import sys; print('-'.join(str(v) for v in sys.version_info))")" >> $GITHUB_OUTPUT
     - uses: prefix-dev/setup-pixi@v0.9.0
       with:
         pixi-version: v0.54.1