Bump nl.talsmasoftware:umldoclet from 2.1.1 to 2.1.2 (#290)

Bumps [nl.talsmasoftware:umldoclet](https://github.com/talsma-ict/umldoclet) from 2.1.1 to 2.1.2.
- [Release notes](https://github.com/talsma-ict/umldoclet/releases)
- [Commits](talsma-ict/umldoclet@2.1.1...2.1.2)

---
updated-dependencies:
- dependency-name: nl.talsmasoftware:umldoclet
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -91,7 +91,7 @@
         <license-maven-plugin.version>4.3</license-maven-plugin.version>
         <jacoco-maven-plugin.version>0.8.11</jacoco-maven-plugin.version>
         <coveralls-maven-plugin.version>4.3.0</coveralls-maven-plugin.version>
-        <umldoclet.version>2.1.1</umldoclet.version>
+        <umldoclet.version>2.1.2</umldoclet.version>
     </properties>
 
     <build>