Bump reactor-test from 3.4.0 to 3.4.8

Bumps [reactor-test](https://github.com/reactor/reactor-core) from 3.4.0 to 3.4.8.
- [Release notes](https://github.com/reactor/reactor-core/releases)
- [Commits](reactor/reactor-core@v3.4.0...v3.4.8)

---
updated-dependencies:
- dependency-name: io.projectreactor:reactor-test
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build.gradle

@@ -114,7 +114,7 @@ subprojects { project ->
         }
 
         dependencies {
-            testImplementation "io.projectreactor:reactor-test:3.4.0"
+            testImplementation "io.projectreactor:reactor-test:3.4.8"
             testImplementation "org.codehaus.groovy:groovy-test-junit5:$groovyVersion"
             testImplementation("org.spockframework:spock-core:$spockVersion") { transitive = false}
             testImplementation "org.junit.jupiter:junit-jupiter-api:5.7.0"