Bump mina-core from 2.1.6 to 2.2.1

[dependabot[bot]]

Bumps mina-core from 2.1.6 to 2.2.1.

Commits

• 023fdeb [maven-release-plugin] prepare release 2.2.1
• 085b0e6 [maven-release-plugin] rollback the release of 2.2.1
• 24a7ab2 [maven-release-plugin] prepare for next development iteration
• 03b8bf5 [maven-release-plugin] prepare release 2.2.1
• 9f4c284 Replaced </?TT> by </?code> in javadoc
• f827f75 Replaced </?tt> by </?code> in javadoc
• 1c3bad3 Fixed an OSGi export typo
• 59af2ca [maven-release-plugin] prepare for next development iteration
• 079d459 [maven-release-plugin] prepare release 2.2.0
• f3b3eea [maven-release-plugin] rollback the release of 2.2.0
• Additional commits viewable in compare view

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