Update update-depedencies.yml

Author: stuartmaxwell

.github/workflows/update-depedencies.yml

@@ -6,6 +6,9 @@ on:
 jobs:
   update-dependencies:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
     steps:
       - name: Get current date
         id: date