tests(test.yml): Update Emacs 28.x to minor ver. 2

Author: jcs090218

.github/workflows/activate.yml

@@ -19,7 +19,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         emacs-version:
-          - 28.1
+          - 28.2
 
     steps:
     - uses: actions/checkout@v2

.github/workflows/test.yml

@@ -20,7 +20,7 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
         emacs-version:
           - 27.2
-          - 28.1
+          - 28.2
           - snapshot
 
     steps: