📦 Update release.yml for "github_actions" label

I'd already classified the "workflows" label as "Miscellaneous", but
"github_actions" is the label that's actually being used.

Author: nevans

.github/release.yml

@@ -20,6 +20,7 @@ changelog:
           - "tests-only"
           - "dependencies"
           - "workflows"
+          - "github_actions"
         authors:
           - "dependabot"
     - title: Miscellaneous