fix cov typo

Author: funnyboy-roks

.github/workflows/test.yml

@@ -68,7 +68,7 @@ jobs:
     runs-on: ubuntu-latest
     name: ubuntu / stable / coverage
     steps:
-      - uses: actions/checkoutv4
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - name: Install stable