Update GitHub actions packages

Update actions/checkout, actions/setup-node, actions/cache, and
actions/upload-artifact from v2 to v3.

Signed-off-by: Austin Vazquez <macedonv@amazon.com>

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

@@ -9,7 +9,7 @@ jobs:
   pull-request-test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: ./
         with:
           script: |