Use ruby 3.1 in github action release target.

Author: Bernard Lambeau

.github/workflows/releases.yml

@@ -25,7 +25,7 @@ jobs:
 
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.4
+          ruby-version: 3.1
           bundler-cache: true
 
       - run: make package
@@ -57,7 +57,7 @@ jobs:
 
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.4
+          ruby-version: 3.1
           bundler-cache: true
 
       - run: make package