fix: allow partial revokes via wallet_revokeSession (follow-up)

[ffmcgee725]

Explanation

This is a follow up PR to #53, fixing a typescript error introduced after updating multichain-api-client package.

References

• Fixes #728

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes