test: Emacs 29.1

Author: jcs090218

.github/workflows/test.yml

@@ -19,7 +19,18 @@ jobs:
           - 26.3
           - 27.2
           - 28.2
-          - snapshot
+          - 29.1
+        experimental: [false]
+        include:
+          - os: ubuntu-latest
+            emacs-version: snapshot
+            experimental: true
+          - os: macos-latest
+            emacs-version: snapshot
+            experimental: true
+          - os: windows-latest
+            emacs-version: snapshot
+            experimental: true
 
     steps:
     - uses: actions/checkout@v3