Fix coverage CI script

https: //github.com/r-lib/actions/issues/559
Change-Id: I0d8fd1739dc4c7bb4ae279b00008882cc4449cc6
diff --git a/.github/workflows/test-coverage.yaml b/.github/workflows/test-coverage.yaml
index 8271db2..b7bb9a8 100644
--- a/.github/workflows/test-coverage.yaml
+++ b/.github/workflows/test-coverage.yaml
@@ -23,7 +23,7 @@
 
       - uses: r-lib/actions/setup-r-dependencies@v2
         with:
-          extra-packages: any::covr
+          extra-packages: any::covr, any::XML
           needs: coverage
 
       - name: Test coverage