Use v2 of r-lib action

Author: cjyetman

.github/workflows/dev-tests.yaml

@@ -31,7 +31,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Setup R on system
-        uses: r-lib/actions/setup-r@v1
+        uses: r-lib/actions/setup-r@v2
         with:
           r-version: ${{ matrix.config.r }}