[Cashtab] Extension version bump

Summary:
Bump extension version, minor bump.

Since last version bump, airdrop features, chronik websites, and styling improvements.

Test Plan:
npm run extension
Confirm build success
Confirm app behavior matches web app

Reviewers: emack, kieran709, #bitcoin_abc

Reviewed By: emack, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D11583