fix(wallet-sdk): increase minimum node version from 10 to 16.20

The dependencies eth-block-tracker@7.1.0 and eth-json-rpc-filters both
require nodejs v14 while the package manifest currently indicates support for v10.

Support for nodejs v14 and lower seems to already have been dropped from
coinbase-wallet-sdk in #932.

This fixes that discrepancy by dropping indicated support for major nodejs versions
10-15,17,19.

packages/wallet-sdk/package.json

@@ -73,6 +73,6 @@
     "typescript": "^5.1.6"
   },
   "engines": {
-    "node": ">= 10.0.0"
+    "node": "^16.20 || ^18.16 || >=20"
   }
 }