build(npm): adhere to Husky deprecation notice

Husky v8 adds the `husky init` subcommand, and v9 changes how it handles
hooks. We no longer need the Husky preamble in our hooks, so update to
the new `init` subcommand and remove the preambles.

Change-Id: I18ea1bbaedbb4213cc04c21413d75c9757ff7986
Signed-off-by: Chris Kay <chris.kay@arm.com>
diff --git a/package.json b/package.json
index 43c897e..7ad5c58 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "type": "module",
   "private": true,
   "scripts": {
-    "postinstall": "husky install",
+    "prepare": "husky",
     "release": "standard-version"
   },
   "engines": {