Specify npm version ~10 (#573)

This was previously set to ~10.4, but there is no node version that
satisifed the constraint of node ~18 and npm ~10.4.

This change follows the approach in the main `clients` repository.

package.json

@@ -176,7 +176,7 @@
   },
   "engines": {
     "node": "~18",
-    "npm": "~10.4.0"
+    "npm": "~10"
   },
   "lint-staged": {
     "./!(jslib)**": "prettier --ignore-unknown --write",