Bump github.com/attestantio/go-eth2-client from 0.21.1 to 0.21.10

[dependabot]

Bumps github.com/attestantio/go-eth2-client from 0.21.1 to 0.21.10.

Changelog

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

0.21.10:

• better validator state when balance not supplied

0.21.9:

• enable custom timeouts for POSTs

0.21.8:

• remove Lodestar proposals workaround
• add client headers for events stream

0.21.7:

• use POST for specific validator and validator balance information

0.21.6:

• use SSZ on a per-call basis

0.21.5:

• ensure POST bodies are logged as JSON

0.21.4:

• additional nil checks
• allow non-mainnet configurations

0.21.3:

• relax requirement for proposals to use the graffiti we request

0.21.2:

• fuzz testing fixes

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

... (truncated)

Commits

• b3d8c14 Better handling of validator state when no balance is present.
• f925432 Better handling of empty responses.
• 633b784 Formatting.
• 512fdce Bump version.
• 2450464 Enable per-request timeout for POSTs.
• 22abb36 Enable per-request timeout for POSTs.
• 166b693 Release 0.21.8
• eff49f7 Use xxxxx rather than *** to mask sensitive data in URLs.
• 73945ba Set appropriate Accept header for events.
• 0138132 Add client headers for events stream.
• 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)

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.