chore(deps): update actions/checkout action to v4 (#88)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/build_studio_images.yml

@@ -28,7 +28,7 @@ jobs:
       id-token: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # Workaround: https://github.com/docker/build-push-action/issues/461
       - name: Setup Docker buildx
@@ -59,7 +59,7 @@ jobs:
     environment: aws
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Standard CML setup
         uses: iterative/setup-cml@v1
         with:
@@ -96,7 +96,7 @@ jobs:
       run:
         working-directory: packer
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: aws-actions/configure-aws-credentials@v4
         with:
           aws-region: us-west-1
@@ -139,7 +139,7 @@ jobs:
       run:
         working-directory: packer
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: aws-actions/configure-aws-credentials@v4
         with:
           aws-region: us-west-1