Use merged actions

Author: jcs090218

.github/workflows/test.yml

@@ -22,13 +22,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - uses: purcell/setup-emacs@master
-      if: matrix.os == 'ubuntu-latest' || matrix.os == 'macos-latest'
-      with:
-        version: ${{ matrix.emacs-version }}
-
-    - uses: jcs090218/setup-emacs-windows@master
-      if: matrix.os == 'windows-latest'
+    - uses: jcs090218/setup-emacs@master
       with:
         version: ${{ matrix.emacs-version }}