v9.2.1

Contributed:

• Add Ledger support for Acala (Thanks to https://github.com/ntduan)

Changes:

• Optimize u8aToHex with direct (non-hex) conversion
• Change all occurences of .substr(...) to .substring(...)
• Sync with upstream Substrate ss58 registry
• Mark deprecated function signatures (no removals)
• Re-enable auto init of cryptoWaitReady()
• Upgrade to @polkadot/wasm-crypto 6.1.1