use r-release so we get binary packages

Author: jameslamb

.github/workflows/r_revdepchecks.yml

@@ -48,7 +48,7 @@ jobs:
           TINYTEX_INSTALLER: TinyTeX
       - uses: r-lib/actions/setup-r@v2
         with:
-          r-version: 'devel'
+          r-version: 'release'
       - name: install system dependencies
         run: |
           brew install libomp