Bump github.com/attestantio/go-eth2-client from 0.16.4 to 0.19.4

[dependabot]

Bumps github.com/attestantio/go-eth2-client from 0.16.4 to 0.19.4.

Changelog

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

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

• 3abaa55 Use V1 of blocks call for proposal submission.
• cc9073d Re-enable older fork versions.
• fa27e6e Standardise function signature.
• 37fbd26 Bump version.
• 66b389b Linting.
• 0ca6acc Linting.
• 640b902 Merge branch 'master' of github.com:attestantio/go-eth2-client
• 3ac7430 Linting.
• 3196354 Update version.
• 6538fae Merge pull request #86 from xenowits/xenowits/slot-proposal
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

[codecov-commenter]

Codecov Report

Merging #548 (b858d4e) into main (6a332c2) will not change coverage.
The diff coverage is n/a.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

@@           Coverage Diff           @@
##             main     #548   +/-   ##
=======================================
  Coverage   33.26%   33.26%           
=======================================
  Files          24       24           
  Lines        5090     5090           
=======================================
  Hits         1693     1693           
  Misses       3178     3178           
  Partials      219      219           

Flag	Coverage Δ
unittests	33.26% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[dependabot]

Superseded by #553.