Bump org.liquibase:liquibase-gradle-plugin in /db-connector

Bumps [org.liquibase:liquibase-gradle-plugin](https://github.com/liquibase/liquibase-gradle-plugin) from 2.1.0 to 2.2.1.
- [Changelog](https://github.com/liquibase/liquibase-gradle-plugin/blob/master/doc/changelog.md)
- [Commits](liquibase/liquibase-gradle-plugin@Release_2.1.0...Release_2.2.1)

---
updated-dependencies:
- dependency-name: org.liquibase:liquibase-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

db-connector/build.gradle

@@ -3,7 +3,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath "org.liquibase:liquibase-gradle-plugin:2.1.0"
+        classpath "org.liquibase:liquibase-gradle-plugin:2.2.1"
     }
 }