Bump eventmodel.version from 2.0 to 2.2

Bumps `eventmodel.version` from 2.0 to 2.2.

Updates `org.commonjava.indy.service:indy-event-model` from 2.0 to 2.2

Updates `org.commonjava.indy.service:indy-event-model-serializer` from 2.0 to 2.2

---
updated-dependencies:
- dependency-name: org.commonjava.indy.service:indy-event-model
  dependency-version: '2.2'
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.commonjava.indy.service:indy-event-model-serializer
  dependency-version: '2.2'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -42,7 +42,7 @@
         <apiVersion>1</apiVersion>
         <projectEmail>https://github.com/Commonjava/indy-tracking-service</projectEmail>
         <atlas.version>1.2.1</atlas.version>
-        <eventmodel.version>2.0</eventmodel.version>
+        <eventmodel.version>2.2</eventmodel.version>
         <cassandra.version>3.11.5</cassandra.version>
     </properties>