Merge pull request #258 from ruby-go-gem/golangci_lint_version_env

ci: Extract to GOLANGCI_LINT_VERSION

Author: sue445

.github/workflows/build.yml

@@ -21,6 +21,7 @@ on:
 env:
   GO_TEST_ARGS: -coverprofile coverage.out -covermode atomic
   TEST_GEM_DIR: ruby/testdata/example/
+  GOLANGCI_LINT_VERSION: v1.60
 
 jobs:
   generate-matrix:
@@ -144,7 +145,7 @@ jobs:
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v6
         with:
-          version: v1.60
+          version: ${{ env.GOLANGCI_LINT_VERSION }}
           args: --build-tags ${{ env.BUILD_TAG }}
 
       - name: Slack Notification (not success)