Potential fix for code scanning alert no. 14: Workflow does not contain permissions

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
Signed-off-by: Priyankar Pal  <88102392+priyankarpal@users.noreply.github.com>

Author: priyankarpal

.github/workflows/contributions.yml

@@ -1,4 +1,6 @@
 name: Add contributors
+permissions:
+  issues: write
 on:
   pull_request_target:
     types: