Bump de.undercouch.download from 5.5.0 to 5.6.0 (reactor#3078)

Bumps [de.undercouch.download](https://github.com/michel-kraemer/gradle-download-task) from 5.5.0 to 5.6.0.
- [Release notes](https://github.com/michel-kraemer/gradle-download-task/releases)
- [Commits](michel-kraemer/gradle-download-task@5.5.0...5.6.0)

---
updated-dependencies:
- dependency-name: de.undercouch.download
  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>

build.gradle

@@ -37,7 +37,7 @@ plugins {
 	id 'com.github.johnrengelman.shadow' version '7.1.2' apply false
 	//we now need version of Artifactory gradle plugin deployed on Maven Central, see above
 	id 'me.champeau.gradle.japicmp' version '0.4.2' apply false
-	id 'de.undercouch.download' version '5.5.0' apply false
+	id 'de.undercouch.download' version '5.6.0' apply false
 	id 'io.spring.javadoc' version '0.0.1' apply false
 	id 'io.spring.javadoc-aggregate' version '0.0.1' apply false
 	id 'biz.aQute.bnd.builder' version '6.4.0' apply false