Update TagBot config

Author: andrewjradcliffe

.github/workflows/TagBot.yml

@@ -7,6 +7,8 @@ on:
     inputs:
       lookback:
         default: 3
+permissions:
+  contents: write
 jobs:
   TagBot:
     if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
@@ -15,4 +17,4 @@ jobs:
       - uses: JuliaRegistries/TagBot@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
-          ssh: ${{ secrets.DOCUMENTER_KEY }}
+          ssh: ${{ secrets.DOCUMENTER_KEY }}