Use emacs 29.1 instead of snapshot

Author: p4v4n

Diff for: .github/workflows/lint-emacs.yml

@@ -36,7 +36,7 @@ jobs:
 
     strategy:
       matrix:
-        emacs_version: ['snapshot']
+        emacs_version: ['29.1']
 
     steps:
     - name: Set up Emacs