Updated GHA workflow to checkout@v4

.github/workflows/check-bioc.yml

@@ -130,7 +130,7 @@ jobs:
       ## Most of these steps are the same as the ones in
       ## https://github.com/r-lib/actions/blob/master/examples/check-standard.yaml
       ## If they update their steps, we will also need to update ours.
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Query dependencies
         run: |