Bump net.sourceforge.plantuml:plantuml from 1.2023.5 to 1.2023.9

Bumps [net.sourceforge.plantuml:plantuml](https://github.com/plantuml/plantuml) from 1.2023.5 to 1.2023.9.
- [Release notes](https://github.com/plantuml/plantuml/releases)
- [Commits](plantuml/plantuml@v1.2023.5...v1.2023.9)

---
updated-dependencies:
- dependency-name: net.sourceforge.plantuml:plantuml
  dependency-type: direct:production
...

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

pom.xml

@@ -156,7 +156,7 @@
         <dependency>
             <groupId>net.sourceforge.plantuml</groupId>
             <artifactId>plantuml</artifactId>
-            <version>1.2023.5</version>
+            <version>1.2023.9</version>
         </dependency>
         <dependency>
             <groupId>org.apache.xmlgraphics</groupId>