Update a gem name in autorelease workflow

Forgot to update when copying and pasting from another gem.

Author: AgaDufrat

.github/workflows/autorelease.yml

@@ -7,6 +7,6 @@ jobs:
   autorelease:
     uses: alphagov/govuk-infrastructure/.github/workflows/autorelease-rubygem.yml@main
     with:
-      gem_name: content_block_tools
+      gem_name: govuk_content_item_loader
     secrets:
       GH_TOKEN: ${{ secrets.GOVUK_CI_GITHUB_API_TOKEN }}