Pin SHA commits and update docs with latest versions (#1338)

* Update GitHub Actions to use checkout and setup-python actions version 7

* Fix formatting in publish-immutable-actions.yml

.github/workflows/publish-immutable-actions.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checking out
-        uses: actions/checkout@v6
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
       - name: Publish
         id: publish
-        uses: actions/publish-immutable-action@v0.0.4
+        uses: actions/publish-immutable-action@4bc8754ffc40f27910afb20287dbbbb675a4e978 # v0.0.4