chore: upgrade GitHub Actions from Node 20 to Node 24 (#32)

Author: mcollins-ttd

.github/workflows/test-pull-request.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: macos-14
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - name: Install dependencies
         run: brew install swiftlint