Update codecov/codecov-action action to v6

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
           pytest --cov=meshcore_hub --cov-report=xml --cov-report=term-missing --junitxml=junit.xml -o junit_family=legacy
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
         if: always()
         with:
           files: ./coverage.xml
@@ -59,7 +59,7 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
 
       - name: Upload test results to Codecov
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
         if: ${{ !cancelled() }}
         with:
           report_type: test_results