Use new codecov upload

Author: loevgaard

.github/workflows/build.yaml

@@ -185,9 +185,9 @@ jobs:
                 run: "vendor/bin/phpunit --coverage-clover=.build/logs/clover.xml"
 
             -   name: "Send code coverage report to Codecov.io"
-                env:
-                    CODECOV_TOKEN: "${{ secrets.CODECOV_TOKEN }}"
-                run: "bash <(curl -s https://codecov.io/bash)"
+                uses: "codecov/codecov-action@v3"
+                with:
+                    token: "${{ secrets.CODECOV_TOKEN }}"
 
     mutation-tests:
         name: "Mutation tests"