Update dependency @polkadot/api to v12

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@polkadot/api (source)	^11.3.1 -> ^12.0.2

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Release Notes

polkadot-js/api (@​polkadot/api)

v12.0.2

Compare Source

Important Changes:

• withSignedTransaction: This option has been added to SignerOptions. When using signAndSend, signAsync, and dryRun you may now enable or disable the use of the signedTransaction field by adding the withSignedTransaction option. When withSignedTransaction is not enabled but the signer adds a signedTransaction the api will error.
  • Always disabled by default.
  • This ensures no big breaking changes happen to the interface of signPayload.
  • withSignedTransaction has also been added to the SignerPayload type which allows for payload.toPayload() to include the option.
• signAsync: now accepts the signedTransaction field as well. This means that if withSignedTransaction is enabled, and signedTransaction is present the api will adjust the current payload attached to the SubmittableExtrinsic, and add the signature. Then the user can call .send() as they please.
• dryRun: All steps will be the same as signAsync with the exception that .send() has never needed to be called.

Contributed:

• Add LocationToAccountApi::convert_location runtime API (Thanks to https://github.com/bkontur)

v12.0.1

Compare Source

Important Changes:

• Addition of an optional signedTransaction field to the SignerResult response for injected signers. This only applies to the signPayload method exposed in the Signer interface for polkadot-js. As the name suggests the field expects a signed transaction (extrinsic) when inputted. When its present, the api will not add the signature to the payload, but instead broadcast the inputted signed transaction. This means the signer may modify the payload it's given. The only part of the payload that may not be modified is the call data. This is verified on the api, and will throw an error if it does not match the initial payloads call data.
  • This is very useful for signers that want to adjust the mode and metadataHash field for the CheckMetadataHash signed extension.
  • Note that this is not your traditional breaking change since it more-so acts as an addition, but since this is a high magnitude change it is going to be considered a MAJOR bump.
  • For more info please review the following PR (#​5914)

Changes:

• Replace system_accountNextIndex with runtime api call accountNonceApi for api.derive.tx.signingInfo
• Sanitize eras for api.derive.staking._stakerRewards

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