Bump @dfinity/identity from 2.0.0 to 2.1.1

Bumps [@dfinity/identity](https://github.com/dfinity/agent-js/tree/HEAD/packages/identity) from 2.0.0 to 2.1.1.
- [Release notes](https://github.com/dfinity/agent-js/releases)
- [Changelog](https://github.com/dfinity/agent-js/blob/main/docs/CHANGELOG.md)
- [Commits](https://github.com/dfinity/agent-js/commits/v2.1.1/packages/identity)

---
updated-dependencies:
- dependency-name: "@dfinity/identity"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>