feat!: update API URLs

[janniks]

From #1493

While we are at, let's also update the following API URL references to point to the new infra services at https://api.mainnet.hiro.so and https://api.testnet.hiro.so, respectively.

stacks.js/packages/network/src/network.ts

Lines 4 to 5 in c9e420e

	export const HIRO_MAINNET_DEFAULT = 'https://stacks-node-api.mainnet.stacks.co';
	export const HIRO_TESTNET_DEFAULT = 'https://stacks-node-api.testnet.stacks.co';

Should maybe be considered breaking change 🤔

[janniks]

• fixed by https://github.com/hirosystems/stacks.js/pull/1618/files