v1.6.1

Electra

• Pass aggregate.committee_bits to get_committee_indices (#4742)

Gloas

• Clarify PTC description (#4719)
• Clean up Gloas specs (part 4) (#4721)
• Add PTC subsection to validator assignment section (#4713)
• Clean up Gloas specs (part 5) (#4738)
• Add off-protocol value to the bid (#4733)
• Fix tests to ensure merge functions do not need to be modified (#4718)
• Fix randao mix processing in Gloas (#4728)
• Set block_hash in the latest bid during Gloas state upgrade (#4739)
• Run process_builder_pending_payments before effective balance updates (#4737)
• Clean up Gloas specs (part 6) (#4741)

Other

• Add debug tools for SSZ deserialization (#4729)
• build(deps): bump the actions group with 2 updates (#4735)
• Update testnet genesis state descriptions (#4727)
• Use proper integer encoding for Union in SSZ (#4725)
• Bump version to v1.6.1 (#4743)