Print tool versions

To debug GH-313 easier

Author: kachick

.github/workflows/reusable-bump-flake-lock-and-selfup.yml

@@ -48,6 +48,10 @@ jobs:
     env:
       PR_BRANCH: bot-update-flake-lock
     steps:
+      - name: Inspect tool versions
+        run: |
+          gh --version
+          git --version
       - name: Install selfup
         env:
           GH_TOKEN: ${{ github.token }}