ci: use codecov @v6 [citest_skip]

use latest version of codecov @v6

Signed-off-by: Rich Megginson <rmeggins@redhat.com>

Author: richm

.github/workflows/python-unit-test.yml

@@ -92,4 +92,4 @@ jobs:
           TOXENV="$toxenvs" lsr_ci_runtox
 
       - name: Upload coverage reports to Codecov
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6