chore: set explicit workflow permissions and pin down actions (#2090)

Signed-off-by: tdruez <tdruez@aboutcode.org>

Author: tdruez

.github/workflows/publish-pypi-release.yml

@@ -1,4 +1,4 @@
-name: Build Python distributions, publish on PyPI, and create a GitHub release
+name: Build Python distributions, publish on PyPI, and create a GH release
 
 on:
   workflow_dispatch:
@@ -74,11 +74,6 @@ jobs:
       contents: write
 
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
-        with:
-          persist-credentials: false
-
       - name: Download package distributions
         uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3  # v8.0.0
         with: