Fix dmg-release.yml error (#1220)

Summary:
Key was duplicated. :(
Pull Request resolved: https://github.com/facebook/flipper/pull/1220

Reviewed By: mweststrate

Differential Revision: D21861770

Pulled By: passy

fbshipit-source-id: 6affdfbc488628465afc1a59c55ef0ec7ed61dff

.github/workflows/dmg-release.yml

@@ -27,6 +27,7 @@ jobs:
       with:
         name: 'Flipper-mac.dmg'
         path: 'dist/Flipper-mac.dmg'
+
   publish:
     runs-on: ubuntu-latest
     needs: build
@@ -46,7 +47,8 @@ jobs:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       with:
         args: '*.dmg'
-  publish:
+
+  publish2:
     runs-on: ubuntu-latest
     needs: build