fix: dependabot automatic changeset security warnings (#901)

Author: kylemcd

.github/workflows/dependabot-changeset.yml

@@ -1,7 +1,7 @@
 name: Dependabot Changeset
 
 on:
-  pull_request_target:
+  pull_request:
     types: [opened]
   workflow_dispatch:
     inputs:
@@ -10,6 +10,10 @@ on:
         required: true
         type: string
 
+permissions:
+  contents: write
+  pull-requests: read
+
 jobs:
   changeset:
     name: Add changeset for dependency update