style: format code with Gofumpt and Prettier

This commit fixes the style issues introduced in 5bc73a5 according to the output
from Gofumpt and Prettier.

Details: #2595

hack/actions/gen/main.go

@@ -291,7 +291,7 @@ func generateWorkflowStruct(data *Data) Workflow {
 
 func sortedPullRequestPaths(data *Data) []string { // TODO: ContainerTypeごとなどいろいろ条件分岐
 	// イメージをビルドする全ワークフローに共通のパス
-	var pullRequestPaths = []string{"hack/docker/gen/main.go", "hack/actions/gen/main.go", ".github/actions/docker-build/action.yaml", ".github/workflows/_docker-image.yaml"}
+	pullRequestPaths := []string{"hack/docker/gen/main.go", "hack/actions/gen/main.go", ".github/actions/docker-build/action.yaml", ".github/workflows/_docker-image.yaml"}
 	// TODO: 残りの処理
 	return pullRequestPaths
 }