Unify python-version in setup step

Co-authored-by: Stan Ulbrych <stanulbrych@gmail.com>

Author: m-aciek

.github/workflows/lint.yml

@@ -39,7 +39,7 @@ jobs:
     steps:
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
-          python-version: 3.x
+          python-version: 3
       - uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b  # v8.1.0
       - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c  # v8.0.1
         with: