Update codecov action to v7

Resolve key verification issues.

Author: Flamefire

.github/workflows/unit-tests.yml

@@ -220,7 +220,7 @@ jobs:
 
       - name: Upload coverage (Codecov)
         if: matrix.coverage && success()
-        uses: codecov/codecov-action@57e3a136b779b570ffcdbf80b3bdc90e7fab3de2 # v6.0.0
+        uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v7.0.0
         with:
           fail_ci_if_error: true
           disable_search: true