update ci flow so setup ruby can use 3.4.5

Author: mensfeld

.github/workflows/push_ruby.yml

@@ -4,6 +4,7 @@ on:
   push:
     tags:
       - v*
+  workflow_dispatch:
 
 permissions:
   contents: read
@@ -24,7 +25,7 @@ jobs:
           fetch-depth: 0
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@a4effe49ee8ee5b8b5091268c473a4628afb5651 # v1.245.0
+        uses: ruby/setup-ruby@472790540115ce5bd69d399a020189a8c87d641f # v1.247.0
         with:
           bundler-cache: false