Update schemas.mdx

[C-Emily-Furlong]

The gov team has started issuing governance participation attestations from the gov team multisig

Description

Adding the gov team multisig address to the list of issuer addresses for gov contribution attestations. We issued the S4 and S5 Grants Council member attestations from the gov team multisig, and will continue to issue gov contribution attestations from this address moving forward.

Tests

n/a

Additional context

Add any other context about the problem you're solving.

Metadata

• Fixes #[Link to Issue]