Bump org.eclipse.jdt:ecj from 3.26.0 to 3.39.0

Bumps [org.eclipse.jdt:ecj](https://github.com/eclipse-jdt/eclipse.jdt.core) from 3.26.0 to 3.39.0.
- [Commits](https://github.com/eclipse-jdt/eclipse.jdt.core/commits)

---
updated-dependencies:
- dependency-name: org.eclipse.jdt:ecj
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -405,7 +405,7 @@
       <!-- Eclipse compiler: useful to generate specific .class file patterns -->
       <groupId>org.eclipse.jdt</groupId>
       <artifactId>ecj</artifactId>
-      <version>3.26.0</version> <!-- last JDK8-compatible version -->
+      <version>3.39.0</version> <!-- last JDK8-compatible version -->
       <scope>test</scope>
     </dependency>
     <dependency>