Bump github.com/attestantio/go-eth2-client from 0.16.4 to 0.19.9

[dependabot]

Bumps github.com/attestantio/go-eth2-client from 0.16.4 to 0.19.9.

Changelog

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

dev:

• 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
• add helpers to versioned signed blinded beacon block
• add BlockHash() to versioned signed beacon block
• add ExecutionBlockHash() to versioned signed beacon block
• rename data gas fields to blob gas for 1.4.0-beta1

0.18.0:

• support Graffiti, ProposerIndex and RandaoReveal on VersionedBeaconBlock
• use SSZ instead of JSON where available

0.17.0:

• reworked JSON parsing for custom types to make easier to transition to another parser in future
• added Deneb spec types

Commits

• 21f7dd4 Bump version.
• 16ce83f Do not deactive client on user error or timeout.
• 6c557af Update dependencies.
• fa404f5 Add bls_to_execution_change event.
• 4dec6bb Add attester and proposer slashing events.
• 46f0e74 Use state instead of multiple validators requests.
• a05485e Add endpoint metrics for prometheus.
• 3087274 Add deprecation notice to service.
• 9d4133d Tidy up validator state logic.
• cddc7a4 Add deprecation notes to test clients.
• Additional commits viewable in compare view

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f6a91e5) 33.22% compared to head (4c88976) 33.22%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #565   +/-   ##
=======================================
  Coverage   33.22%   33.22%           
=======================================
  Files          24       24           
  Lines        5096     5096           
=======================================
  Hits         1693     1693           
  Misses       3184     3184           
  Partials      219      219           

Flag	Coverage Δ
unittests	33.22% <ø> (ø)

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