Bump guru.nidi:graphviz-java from 0.17.0 to 0.18.1 (#588)

Bumps [guru.nidi:graphviz-java](https://github.com/nidi3/graphviz-java) from 0.17.0 to 0.18.1.
- [Release notes](https://github.com/nidi3/graphviz-java/releases)
- [Commits](nidi3/graphviz-java@graphviz-java-parent-0.17.0...graphviz-java-parent-0.18.1)

---
updated-dependencies:
- dependency-name: guru.nidi:graphviz-java
  dependency-version: 0.18.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -76,7 +76,7 @@
     <version.com.fasterxml.jackson>2.19.0</version.com.fasterxml.jackson>
     <version.com.networknt>1.5.6</version.com.networknt>
     <version.commons.lang>3.17.0</version.commons.lang>
-    <version.graphviz>0.17.0</version.graphviz>
+    <version.graphviz>0.18.1</version.graphviz>
     <version.hamcrest>3.0</version.hamcrest>
     <version.javax.validation>2.0.1.Final</version.javax.validation>
     <version.jsonassert>1.5.3</version.jsonassert>