Add Emacs 28.2 to CI, cut down matrix a little

Author: purcell

.github/workflows/test.yml

@@ -13,17 +13,16 @@ jobs:
       matrix:
         emacs_version:
           - 25.1
-          - 25.2
           - 25.3
           - 26.1
-          - 26.2
           - 26.3
           - 27.1
           - 27.2
           - 28.1
+          - 28.2
           - snapshot
         include:
-          - emacs_version: 28.1
+          - emacs_version: 28.2
             target: deploy-manual
     steps:
     - uses: cachix/install-nix-action@v16