chore(deps): update dependency @polkadot/keyring to v12

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@polkadot/keyring (source)	^11.1.2 -> ^12.0.0

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Release Notes

polkadot-js/common (@​polkadot/keyring)

v12.3.2

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Changes:

• Adjust SubstrateNetwork typing with HexString genesisHash
• Re-export Constructor<T> type (deprecated, replaced with Class<T>)

v12.3.1

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Changes:

• Only allow padding characters in base64 strings
• Expand typings for keyring meta with known keys
• Adjust object index access for stricter tsconfig settings

v12.2.2

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Changes:

• Apply missing count assignment for for (...) loops
• Remove unused @types/* dev dependencies
• Upgrade dependencies to latest stable versions

v12.2.1

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Changes:

• Align u8aToBigInt tests with u8aToBn
• Unroll loops on most-frequently used paths for u8aToBigInt
• Add module to package.json export map (ESM-only)
• Upgrade dependencies to latest stable versions

v12.1.2

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Changes:

• Adjust typing for isChildClass & Constructor usage

v12.1.1

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Changes:

• Add shareable identity & noop functions
• Flatten Buffer | Uint8Array types (as used) to base-only Uint8Array
• Apply readonly specifiers to private class fields where applicable
• Adjust compilation output for __internal__ class fields
• Remove unused types from util
• Upgrade dependencies to latest stable versions

v12.0.1

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Contributed:

• Add Cere genesisHash (Thanks to https://github.com/shamilkhan)

Changes:

• Swap secp256k1 functionality to @noble/curves
• Swap ed25519 functionality to @noble/curves
• Replace tweetnacl secretbox usage with slimmer local version
• Adjust isCodec helper with closer API alignment
• Initial steps to multi-language bip39 support
• Use Node webcrypto for Node getRandomValues support
• Upgrade dependencies to latest stable versions
• Drop support for Node 14 (EOL 30 Apr 2023)

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