chore(deps): bump org.camunda.bpm:camunda-bpm-assert

Bumps org.camunda.bpm:camunda-bpm-assert from 7.20.0 to 7.21.0.

---
updated-dependencies:
- dependency-name: org.camunda.bpm:camunda-bpm-assert
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

integration/camunda-bpm/pom.xml

@@ -16,7 +16,7 @@
 
   <properties>
     <camunda-bpm.version>7.20.0</camunda-bpm.version>
-    <camunda-bpm-assert.version>${camunda-bpm.version}</camunda-bpm-assert.version>
+    <camunda-bpm-assert.version>7.21.0</camunda-bpm-assert.version>
     <camunda-platform-7-mockito.version>7.20.0</camunda-platform-7-mockito.version>
   </properties>