Update action metadata to use node24 runtime

Changed the 'using' field in action metadata YAML from 'node16' to 'node24' in test utilities and tests to reflect the updated Node.js runtime environment.

languageserver/src/test-utils/action-metadata.ts

@@ -16,7 +16,7 @@ inputs:
     description: 'Repository name with owner. For example, actions/checkout'
     deprecationMessage: 'Use repository instead'
 runs:
-  using: node16
+  using: node24
   main: dist/index.js
   post: dist/index.js
 `;

languageserver/src/utils/action-metadata.test.ts

@@ -12,7 +12,7 @@ inputs:
     description: Repository name with owner. For example, actions/checkout
     default: \${{ github.repository }}
 runs:
-  using: node16
+  using: node24
   main: dist/index.js
   post: dist/index.js
 `;
@@ -231,7 +231,7 @@ inputs:
     description: 📦 Repository 📦 name with owner. For example, actions/checkout
     default: \${{ github.repository }}
 runs:
-  using: node16
+  using: node24
   main: dist/index.js
   post: dist/index.js
 `;