v5.6.1

Contributed:

• Fix installation instructions in @polkadot/x-global (Thanks to https://github.com/raoulmillais)

Changes:

• Conform to new ss58 encoding with ids up to 16,383 (>= 64 as 2 bytes)
• Use JS sqrt inside bnSqrt when value <= MAX_SAFE_INTEGER
• Adjust all Buffer.from usages, prefer Uint8Array where possible
• Expand tests for keyring with vrf{Sign, Verify}
• Align @polkadot/networks with latest ss58 registry