ci: scope down GitHub Token permissions (#80)

* ci: scope down permissions for update_snapshot.yml

* ci: scope down permissions for build.yml

Author: AdnaneKhan

.github/workflows/build.yml

@@ -5,6 +5,9 @@ on:
     - main
   workflow_dispatch:
   pull_request:
+permissions:
+  contents: read
+
 jobs:
   Build-and-Test-CDK:
     runs-on: ubuntu-latest

.github/workflows/update_snapshot.yml

@@ -6,6 +6,9 @@ on:
     branches:
        - 'dependabot/**'
 
+permissions:
+  contents: write
+
 jobs:
   update:
     runs-on: ubuntu-latest