fix: keystone dep breaks yarn 4 installation

If you try to use web3-onboard with yarn v4 (although I think the
problem will be there with yarn v2 and v3) it fails with:
YN0001: │ Error: @keystonehq/eth-keyring@^0.14.00.3 isn't supported by
any available resolver

First install is ok, but if you run the install again you’ll get the
above. 0.14.00.3 is apparently not a valid range and the only way to
get this fixed is to fix the dependency. Yarn v1 resolves
0.14.00.3 to 0.14.4 and that is the version I’ve set here.

packages/keystone/package.json

@@ -57,7 +57,7 @@
   "dependencies": {
     "@ethereumjs/tx": "^3.4.0",
     "@ethersproject/providers": "^5.5.0",
-    "@keystonehq/eth-keyring": "^0.14.00.3",
+    "@keystonehq/eth-keyring": "^0.14.4",
     "@web3-onboard/common": "^2.4.1",
     "@web3-onboard/hw-common": "^2.3.2"
   }