ci: Test Emacs 26 and 27

Author: jcs090218

Diff for: .github/workflows/test.yml

@@ -19,10 +19,9 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         emacs-version:
+          - 26.3
+          - 27.2
           - 28.2
-          - 29.1
-          - 29.2
-          - 29.3
           - 29.4
         include:
           - os: ubuntu-latest
@@ -31,6 +30,15 @@ jobs:
           - os: macos-latest
             emacs-version: snapshot
             experimental: true
+          - os: windows-latest
+            emacs-version: snapshot
+            experimental: true
+        exclude:
+          - os: macos-latest
+            emacs-version: 26.3
+          - os: macos-latest
+            emacs-version: 27.2
+
     steps:
       - uses: actions/checkout@v4
       - uses: jcs090218/setup-emacs@master