Update Tagbot SSH key (#97)

Author: barucden

.github/workflows/tagbot.yml

@@ -28,6 +28,4 @@ jobs:
       - uses: JuliaRegistries/TagBot@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
-          # Edit the following line to reflect the actual name of the GitHub Secret containing your private key
-          ssh: ${{ secrets.DOCUMENTER_KEY }}
-          # ssh: ${{ secrets.NAME_OF_MY_SSH_PRIVATE_KEY_SECRET }}
+          ssh: ${{ secrets.TAGBOT_KEY }}