Bump github.com/attestantio/go-eth2-client from 0.21.1 to 0.21.8

[dependabot[bot]]

Bumps github.com/attestantio/go-eth2-client from 0.21.1 to 0.21.8.

Changelog

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

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

Commits

• 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.
• 5f15ea2 Remove unused code.
• a947ded Merge pull request #148 from nflaig/patch-1
• 03cad5a Remove workaround for Lodestar when submitting proposal
• fba4f24 Use POST for validator balances.
• 704ceba Merge pull request #146 from attestantio/post-validators
• 1a1e483 Use POST to obtain validator data.
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #643.