ci: scope down GitHub Token permissions (#3680)

* ci: scope down permissions for release_pr.yml

* ci: scope down permissions for notify_release.yml

---------

Co-authored-by: Matt Creaser <[email protected]>

Author: AdnaneKhan

.github/workflows/notify_release.yml

@@ -9,6 +9,9 @@ on:
     types: [created, released]
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
+permissions:
+  contents: read
+
 jobs:
   # This workflow contains a single job called "notify"
   notify:

.github/workflows/release_pr.yml

@@ -5,6 +5,10 @@ env:
   GIT_USER_NAME: awsmobilesdk-dev+ghops
   GIT_USER_EMAIL: [email protected]
   BASE_BRANCH: main
+permissions:
+  contents: write
+  pull-requests: write
+
 jobs:
   create_pr_for_next_release:
     runs-on: ubuntu-latest