ci: Bump Emacs 29.x to 4

Author: jcs090218

.github/workflows/test.yml

@@ -20,7 +20,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         emacs-version:
-          - "29.3"
+          - "29.4"
         experimental: [false]
         include:
           - os: ubuntu-latest