chore: fix workflow stage "tests-Tests"

Author: hasezoey

.github/workflows/tests.yml

@@ -24,7 +24,7 @@ jobs:
       - name: ESLint
         run: yarn --cwd packages/mongodb-memory-server-core run eslint
       - name: Tests
-        run: yarn run coverage
+        run: yarn --cwd packages/mongodb-memory-server-core run coverage
         env:
           CI: true
       - name: Send codecov.io stats