[bot]: bump net.revelc.code:impsort-maven-plugin from 1.9.0 to 1.13.0 (#3206)

Bumps net.revelc.code:impsort-maven-plugin from 1.9.0 to 1.13.0.

---
updated-dependencies:
- dependency-name: net.revelc.code:impsort-maven-plugin
  dependency-version: 1.13.0
  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>

Author: dependabot[bot]

build/optaplanner-build-parent/pom.xml

@@ -72,7 +72,7 @@
     <version.compiler.plugin>3.8.1</version.compiler.plugin>
     <version.dependency.plugin>3.5.0</version.dependency.plugin>
     <version.formatter.plugin>2.23.0</version.formatter.plugin>
-    <version.impsort.plugin>1.9.0</version.impsort.plugin>
+    <version.impsort.plugin>1.13.0</version.impsort.plugin>
     <version.jacoco.plugin>0.8.11</version.jacoco.plugin>
     <!--
       Do not upgrade unless prepared to deal with JPMS issues.