chore: merge steps

Author: lcdsmao

.github/workflows/dart-ci.yaml

@@ -29,15 +29,8 @@ jobs:
       - name: Set environment
         if: startsWith(matrix.os, 'windows')
         run: echo "%LOCALAPPDATA%\Pub\Cache\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
-
-      - name: Get dependencies for macos and ubuntu
-        if: startsWith(matrix.os, 'macos') || startsWith(matrix.os, 'ubuntu')
-        run: |
-          dart pub global activate melos
-          melos bootstrap
 
-      - name: Get dependencies for Windows
-        if: startsWith(matrix.os, 'windows')
+      - name: Get dependencies
         run: |
           dart pub global activate melos
           melos bootstrap