Bumb gh workflow actions/checkout from v2 to v3

Change-Id: I0f99ffe981a303b155cbf3cbbcdb29a92be81b69
diff --git a/.github/workflows/test-coverage.yaml b/.github/workflows/test-coverage.yaml
index b7bb9a8..4a96993 100644
--- a/.github/workflows/test-coverage.yaml
+++ b/.github/workflows/test-coverage.yaml
@@ -15,7 +15,7 @@
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: r-lib/actions/setup-r@v2
         with: