chore(deps): bump camunda-bpm.version from 7.20.0 to 7.21.0 (#969)

Bumps `camunda-bpm.version` from 7.20.0 to 7.21.0.

Updates `org.camunda.bpm:camunda-bom` from 7.20.0 to 7.21.0

Updates `org.camunda.bpm.springboot:camunda-bpm-spring-boot-starter-test` from 7.20.0 to 7.21.0

---
updated-dependencies:
- dependency-name: org.camunda.bpm:camunda-bom
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.camunda.bpm.springboot:camunda-bpm-spring-boot-starter-test
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

integration/camunda-bpm/pom.xml

@@ -15,7 +15,7 @@
   <packaging>pom</packaging>
 
   <properties>
-    <camunda-bpm.version>7.20.0</camunda-bpm.version>
+    <camunda-bpm.version>7.21.0</camunda-bpm.version>
     <camunda-bpm-assert.version>${camunda-bpm.version}</camunda-bpm-assert.version>
     <camunda-platform-7-mockito.version>7.21.0</camunda-platform-7-mockito.version>
   </properties>