Rename team-solana label to team-new-networks

[mcmire]

Explanation

The team-solana issue label in the extension and mobile repos has been renamed to team-new-networks. The create-update-issues workflow uses this to know which teams to assign to tickets representing controller upgrades. Updating this label in teams.json ensures that this workflow won't break when a new major version of @metamask/multichain-transactions-controller is released.

References

Noticed in Slack.

Checklist

• [x] I've updated the test suite for new or updated code as appropriate
• [x] I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• [x] 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