Bump mavenVersion from 2.1.0 to 2.2.1
Bump mavenVersion from 2.1.0 to 2.2.1

Bumps `mavenVersion` from 2.1.0 to 2.2.1.

Updates `maven-plugin-api` from 2.1.0 to 2.2.1

Updates `maven-toolchain` from 2.1.0 to 2.2.1

---
updated-dependencies:
- dependency-name: org.apache.maven:maven-plugin-api
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.maven:maven-toolchain
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
mojohaus/keytool