chore(deps-dev): bump @electron-forge/maker-dmg (#755)

Bumps [@electron-forge/maker-dmg](https://github.com/electron/forge) from 7.4.0 to 7.8.1.
- [Release notes](https://github.com/electron/forge/releases)
- [Changelog](https://github.com/electron/forge/blob/main/CHANGELOG.md)
- [Commits](electron/forge@v7.4.0...v7.8.1)

---
updated-dependencies:
- dependency-name: "@electron-forge/maker-dmg"
  dependency-version: 7.8.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

console/atest-desktop/package-lock.json

@@ -15,7 +15,7 @@
   "devDependencies": {
     "@electron-forge/cli": "^7.8.1",
     "@electron-forge/maker-deb": "^7.4.0",
-    "@electron-forge/maker-dmg": "^7.4.0",
+    "@electron-forge/maker-dmg": "^7.8.1",
     "@electron-forge/maker-rpm": "^7.4.0",
     "@electron-forge/maker-squirrel": "^7.8.1",
     "@electron-forge/maker-wix": "^7.4.0",