Run Rust bindings workflow latest Ruby, but not head

Author: vinistock

.github/workflows/rust-bindings.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: head
+          ruby-version: 3.4
           bundler-cache: true
       - name: Set up Rust
         uses: dtolnay/rust-toolchain@master
@@ -60,7 +60,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: head
+          ruby-version: 3.4
           bundler-cache: true
       - name: Set up Rust
         uses: dtolnay/rust-toolchain@master
@@ -94,7 +94,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: head
+          ruby-version: 3.4
           bundler-cache: true
       - name: rake cargo:build
         run: bundle exec rake cargo:build