Update actions

Author: shugo

.github/workflows/push_gem.yml

@@ -24,23 +24,23 @@ jobs:
     steps:
       # Set up
       - name: Harden Runner
-        uses: step-security/harden-runner@c6295a65d1254861815972266d5933fd6e532bdf # v2.11.1
+        uses: step-security/harden-runner@v2
         with:
           egress-policy: audit
 
-      - uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+      - uses: actions/checkout@v4
         with:
           submodules: true
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@cacc9f1c0b3f4eb8a16a6bb0ed10897b43b9de49 # v1.176.0
+        uses: ruby/setup-ruby@v1
         with:
           bundler-cache: true
           ruby-version: ruby
 
       # Release
       - name: Publish to RubyGems
-        uses: rubygems/release-gem@a25424ba2ba8b387abc8ef40807c2c85b96cbe32 # v1.1.1
+        uses: rubygems/release-gem@v1
 
       - name: Create GitHub release
         run: |