fix: bump k8s manifests branch version (#336)

This PR bumps the version of k8s-manifests-branch to fix the issue with
the diag generation.

related PR:
splunk/ta-automation-k8s-manifests#106

test workflow run:
-
https://github.com/splunk/splunk-add-on-for-google-workspace/actions/runs/10631152841
-
https://github.com/splunk/splunk-add-on-for-servicenow/actions/runs/10919108085

Author: dvarasani-crest

.github/workflows/reusable-build-test-release.yml

@@ -33,7 +33,7 @@ on:
         required: false
         description: "branch for k8s manifests to run the tests on"
         type: string
-        default: "v3.0.8"
+        default: "v3.0.9"
       scripted-inputs-os-list:
         required: false
         description: "list of OS used for scripted input tests"