chore: update codecov gha to v2 (#26)

Author: tim-mwangi

.github/workflows/pr-test.yml

@@ -34,7 +34,7 @@ jobs:
           args: build jacocoTestReport
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v2
         with:
           name: unit test reports
           fail_ci_if_error: true