Try to let dependabot maintain the version comment

It seems like dependabot supports updating the `# vX.Y.Z` comment.
The reason why I disabled this was that it failed to update this, but
maybe it was because it had `, checking sha`. Let me try it again with
that removed.

.github/dependabot.yml

@@ -4,6 +4,3 @@ updates:
     directory: '/'
     schedule:
       interval: 'weekly'
-    ignore:
-      # It doesn't update the version comment for us
-      - dependency-name: 'necojackarc/auto-request-review'

.github/workflows/auto_request_review.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Request review based on files changes and/or groups the author belongs to
-        uses: necojackarc/auto-request-review@b5e81876454003a4ccb9b89cb205c67d77d7035b # v0.8.0, checking sha
+        uses: necojackarc/auto-request-review@b5e81876454003a4ccb9b89cb205c67d77d7035b # v0.8.0
         with:
           # scope: public_repo
           token: ${{ secrets.MATZBOT_GITHUB_TOKEN }}