Fix keyword usage in CI step name

Author: ulgens

.github/workflows/main.yml

@@ -35,7 +35,7 @@ jobs:
     steps:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
 
-      - name: Install uv ${{ env.UV_VERSION }} & Python ${{ env.PYTHON_VERSION }}
+      - name: Install uv ${{ env.UV_VERSION }} & Python ${{ matrix.PYTHON_VERSION }}
         uses: astral-sh/setup-uv@681c641aba71e4a1c380be3ab5e12ad51f415867 # v7.1.6
         with:
           enable-cache: true