Update TagBot.yml

Author: cerisola

.github/workflows/TagBot.yml

@@ -16,4 +16,4 @@ jobs:
           # releases require manual creation. For full automation of such commits,
           # use a PAT with `workflow` scope instead of GITHUB_TOKEN.
           # See: https://github.com/JuliaRegistries/TagBot#commits-that-modify-workflow-files
-          ssh: ${{ secrets.DOCUMENTER_KEY }}
+          ssh: ${{ secrets.TAGBOT_KEY }}