Downgrade TypeScript to fix downstream TS breakage

TypeScript 5.7+ makes Uint8Array generic, which results in type
definitions here that are unusable downstream. This change reverts that,
so this package can still be used on older TS versions.

Author: pimterry

package.json

@@ -76,7 +76,7 @@
     "stream-browserify": "^3.0.0",
     "ts-loader": "^9.3.1",
     "ts-node": "^10.9.1",
-    "typescript": "^5.8.3",
+    "typescript": "5.6.3",
     "util": "^0.12.3",
     "webpack": "^5.37.0",
     "zlib-browserify": "0.0.3"