chore(deps): pin grafana/k6 action to 6940471

Signed-off-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>

Author: renovate-sh-app[bot]

.github/workflows/issue-auto-assign.yml

@@ -8,4 +8,4 @@ permissions:
 
 jobs:
   assign-maintainer:
-    uses: grafana/k6/.github/workflows/issue-auto-assign.yml@master
+    uses: grafana/k6/.github/workflows/issue-auto-assign.yml@6940471b3bb56acd8640d71a7366518d7fad9845 # master