Bump github.com/attestantio/go-eth2-client from 0.19.9 to 0.21.1

[dependabot]

Bumps github.com/attestantio/go-eth2-client from 0.19.9 to 0.21.1.

Changelog

Sourced from github.com/attestantio/go-eth2-client's changelog.

0.21.1:

• fix potential crash when unmarshaling Gwei values
• add WithReducedMemoryUsage() option for http service
• more consistent tracing attributes and codes

0.21.0:

• use v3 of the endpoint to obtain proposals
• add bounds checking for ValidatorState

0.20.0:

• allow delayed start of client, enabling the service even if the underlying beacon node is not ready
• add IsActive() and IsSynced() methods to understand the status of the service
• update multi clients to be aware of delayed start, only using clients that are synced
• use standard errors for common function issues
• add ProposerIndex() to VersionedSignedProposal
• add name to multi clients to differentiate multiple instances
• fully parse provided client URLs, allowing pass through of username, password, etc.

0.19.10:

• add proposer_slashing and attester_slashing events
• add bls_to_execution_change event

0.19.8

• more efficient fetching for large numbers of validators

0.19.7:

• add endpoint metrics for prometheus

0.19.5:

• standardise names of options
• add common options (currently just timeout) to options structs

0.19.4:

• revert SubmitProposal() to use v1 of the API

0.19.0:

• major rework of API; see docs/0.19-changes.md for details

0.18.3:

• do not crash if beacon state is unavailable

0.18.2:

• add 'withdrawable done' state to validators
• use JSON metadata if not present in HTTP header

0.18.1:

• add blinded block contents
• add helpers to versioned signed blinded beacon block
• add debug forkchoice endpoint support
• add ProposerIndex() to BlindedBlocks

... (truncated)

Commits

• 2d68bcd Bump version
• d3cd64e More consistent tracing attributes and codes.
• e8558f6 Merge pull request #122 from infosecual/master
• 666ff63 changed spacing
• c3376fe fixed gwei unmarshal panic
• 858fa8a Merge pull request #121 from nkryuchkov/reduced-memory-usage-option
• aba0d3f Disable memory usage reduction when all validators are requested
• cf6656b Rename a function argument
• cfadbae Add an option for reduced memory usage
• 35616e0 Merge pull request #120 from ObolNetwork/submit-blinded-proposal-endpoint-fix
• Additional commits viewable in compare view

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