Use correct path package

During refactoring #8596, the `basename` import was changed from "path" to
"path/posix", which doesn't properly reduce to the base name.
This caused some filenames to contain the absolute path after publishing.

packages/electron-publish/src/httpPublisher.ts

@@ -1,7 +1,7 @@
 import { Arch } from "builder-util"
 import { stat } from "fs-extra"
 import { ClientRequest } from "http"
-import { basename } from "path/posix"
+import { basename } from "path"
 import { Publisher } from "./publisher"
 import { PublishContext, UploadTask } from "."