workflow: small addition that might help?

Author: CGMossa

.github/workflows/R-CMD-check.yaml

@@ -104,6 +104,7 @@ jobs:
           # Note: the following account information will not work on GHES
           git config user.name "github-actions[bot]"
           git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git update-index --refresh
           git add cached_bindings
           git commit -m "generated bindings"
           git push