fix: add dmg-builder and squirrel-windows to peerDependencies for pnpm (#8052)

Author: taozhou-glean

.changeset/cold-sheep-camp.md

@@ -0,0 +1,5 @@
+---
+"app-builder-lib": patch
+---
+
+fix: add dmg-builder and squirrel-windows to peer dependency for pnpm

packages/app-builder-lib/package.json

@@ -105,6 +105,10 @@
     "dmg-builder": "workspace:*",
     "electron-builder-squirrel-windows": "workspace:*"
   },
+  "peerDependencies": {
+    "dmg-builder": "workspace:*",
+    "electron-builder-squirrel-windows": "workspace:*"
+  },
   "//": "electron-builder-squirrel-windows and dmg-builder added as dev dep for tests (as otherwise `require` doesn't work using Yarn 2)",
   "typings": "./out/index.d.ts"
 }