update github actions definition

.github/workflows/check-standard.yaml

@@ -39,11 +39,11 @@ jobs:
             xargs -L1 git config --unset-all
           git push --prune https://token:$token@github.com/${CLOUDYR_REPO}.git +refs/remotes/origin/*:refs/heads/* +refs/tags/*:refs/tags/*
 
-      - uses: r-lib/actions/setup-r@master
+      - uses: r-lib/actions/setup-r@v2
         with:
           r-version: ${{ matrix.config.r }}
 
-      - uses: r-lib/actions/setup-pandoc@master
+      - uses: r-lib/actions/setup-pandoc@v2
 
       - name: Query dependencies
         run: |