Bump libp2p-identity from 0.2.6 to 0.2.7 (#1929)

Bumps [libp2p-identity](https://github.com/libp2p/rust-libp2p) from 0.2.6 to 0.2.7.
- [Release notes](https://github.com/libp2p/rust-libp2p/releases)
- [Changelog](https://github.com/libp2p/rust-libp2p/blob/master/CHANGELOG.md)
- [Commits](https://github.com/libp2p/rust-libp2p/commits/libp2p-identity-v0.2.7)

---
updated-dependencies:
- dependency-name: libp2p-identity
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Rob <[email protected]>