DNM: Hack avsc dependency to point to oleiman fork w/ SlowBuffer 'fix'

Signed-off-by: Oren Leiman <oren.leiman@redpanda.com>

Author: oleiman

src/transform-sdk/js/schema_registry_example/package-lock.json

@@ -8,7 +8,7 @@
   "dependencies": {
     "@redpanda-data/transform-sdk": "file:../module",
     "@redpanda-data/transform-sdk-sr": "file:../sr-module",
-    "avsc": "^5.7.7"
+    "avsc": "github:oleiman/avsc#v5.x-redpanda"
   },
   "devDependencies": {
     "esbuild": "0.20.x",