ci: Use a service connection with write access for releases

Author: ubolonton

.azure-pipelines/main.yml

@@ -5,7 +5,6 @@ trigger:
     - master
     - azure-pipelines               # To test changes related to Azure Pipelines.
     - ci                            # To test all CI changes.
-    - grammars
   paths:
     exclude:
     - README.org

.azure-pipelines/release.yml

@@ -61,4 +61,4 @@ jobs:
       - linux
   - template: steps/grammar-bundle/-upload.yml
     parameters:
-      endpoint: emacs-tree-sitter
+      endpoint: github.com_ubolonton