Bump r-lib/actions from 1 to 2

Bumps [r-lib/actions](https://github.com/r-lib/actions) from 1 to 2.
- [Release notes](https://github.com/r-lib/actions/releases)
- [Commits](r-lib/actions@v1...v2)

---
updated-dependencies:
- dependency-name: r-lib/actions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

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

@@ -19,7 +19,7 @@ jobs:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     steps:
       - uses: actions/checkout@v2
-      - uses: r-lib/actions/setup-r@v1
+      - uses: r-lib/actions/setup-r@v2
       - name: Install dependencies
         run: |
           install.packages(c("remotes", "rcmdcheck"))