Update the Codecov action.

Author: desrosj

.github/workflows/reusable-phpunit-tests-v3.yml

@@ -207,7 +207,7 @@ jobs:
 
       - name: Upload test coverage report to Codecov
         if: ${{ inputs.coverage-report }}
-        uses: codecov/codecov-action@b9fd7d16f6d7d1b5d2bec1a2887e65ceed900238 # v4.6.0
+        uses: codecov/codecov-action@7f8b4b4bde536c465e797be725718b88c5d95e0e # v5.1.1
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           file: wp-code-coverage${{ inputs.multisite && '-multisite' || '-single' }}-${{ github.sha }}.xml