GitHub Workflows security hardening (python#96492)

* Update project-updater.yml

Signed-off-by: sashashura <[email protected]>

* Update project-updater.yml

repository-projects: write is not needed because a separate secrets.ADD_TO_PROJECT_PAT is used

Signed-off-by: sashashura <[email protected]>

Author: sashashura

.github/workflows/project-updater.yml

@@ -6,6 +6,9 @@ on:
       - opened
       - labeled
 
+permissions:
+  contents: read
+
 jobs:
   add-to-project:
     name: Add issues to projects