Upgrade Polkadot and Polkadot Asset Hub types for 2000000

[ap211unitech]

Since chains are already live now, I simply followed these steps:

I first changed the versions in: scripts/metadata-get.mjs to be V15:

const META_VERSION_HEX = '0x0F000000';
const META_VERSION = 15;

then

node ./scripts/metadata-get.mjs --url https://polkadot-public-rpc.blockops.network/ws # for polkadot
node ./scripts/metadata-get.mjs --url https://asset-hub-polkadot-rpc.n.dwellir.com  # for polkadot asset hub

and

yarn build:interfaces
yarn test

[TarikGul]

LGTM

[polkadot-js-bot]

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