maint: install XML and CVXR in ci

Author: mirca

Diff for: .github/workflows/check-r-package.yaml

@@ -26,7 +26,7 @@ jobs:
       - uses: r-lib/actions/setup-r-dependencies@v2
         with:
           extra-packages: |
-            any::covr
+            any::covr, any::XML, any::CVXR
           needs: coverage
 
       - name: Test coverage