update electron to v43

electron/node_modules/@electron/osx-sign/dist/cjs/flat.d.ts

@@ -0,0 +1,15 @@
+import { FlatOptions } from './types';
+/**
+ * Generates a flat `.pkg` installer for a packaged Electron `.app` bundle.
+ * @returns A void Promise once the flattening operation is complete.
+ *
+ * @category Flat
+ */
+export declare function buildPkg(_opts: FlatOptions): Promise<void>;
+/**
+ * This function is exported with normal callback implementation.
+ *
+ * @deprecated Please use the Promise-based {@link flatAsync} method instead.
+ * @category Flat
+ */
+export declare const flat: (opts: FlatOptions, cb?: ((error?: Error) => void) | undefined) => void;