update electron to v43

electron/node_modules/app-builder-lib/out/targets/blockmap/blockmap.d.ts

@@ -0,0 +1,16 @@
+import { BlockMapDataHolder } from "builder-util-runtime";
+export type CompressionFormat = "deflate" | "gzip";
+/**
+ * Build a content-defined block map for `inFile` using Rabin fingerprinting.
+ *
+ * Files are processed via streaming (peak memory ≈ RABIN_MAX = 32 KB per chunk,
+ * not the full file size), making this safe for large installers.
+ *
+ * - If `outFile` is omitted: compressed blockmap is appended to `inFile`
+ *   (used for NSIS web installer / AppImage embed); `blockMapSize` is returned.
+ * - If `outFile` is provided: compressed blockmap is written to that file;
+ *   `blockMapSize` is not included in the result.
+ *
+ * Returned `sha512` is SHA-512 of the full file as it exists after the call.
+ */
+export declare function buildBlockMap(inFile: string, compressionFormat: CompressionFormat, outFile?: string): Promise<BlockMapDataHolder>;