Update gem-push.yml

Author: chillaq

.github/workflows/gem-push.yml

@@ -16,11 +16,11 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up Ruby 2.5
+    - name: Set up Ruby 2.5.8
     # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
     # change this to (see https://github.com/ruby/setup-ruby#versioning):
     # uses: ruby/setup-ruby@v1
-      uses: ruby/setup-ruby@55283cc23133118229fd3f97f9336ee23a179fcf # v1.146.0
+      uses: ruby/setup-ruby@v1
       with:
         ruby-version: 2.5.8