build(deps): bump codecov/codecov-action from 3 to 4 (#30)

Author: dependabot[bot]

.github/workflows/codecov.yml

@@ -24,7 +24,7 @@ jobs:
         run: |
           pytest --cov=./slack_cli_hooks/ --cov-report=xml
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: true