Bump io.projectreactor:reactor-test from 3.7.7 to 3.7.8 (#509)

Bumps [io.projectreactor:reactor-test](https://github.com/reactor/reactor-core) from 3.7.7 to 3.7.8.
- [Release notes](https://github.com/reactor/reactor-core/releases)
- [Commits](reactor/reactor-core@v3.7.7...v3.7.8)

---
updated-dependencies:
- dependency-name: io.projectreactor:reactor-test
  dependency-version: 3.7.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

settings.gradle.kts

@@ -32,7 +32,7 @@ dependencyResolutionManagement {
       library("boot-test", "org.springframework.boot", "spring-boot-test").versionRef("spring-boot")
       library("boot-test-autoconfigure", "org.springframework.boot", "spring-boot-test-autoconfigure").versionRef("spring-boot")
       library("boot-testcontainers", "org.springframework.boot", "spring-boot-testcontainers").versionRef("spring-boot")
-      library("projectreactor", "io.projectreactor:reactor-test:3.7.7")
+      library("projectreactor", "io.projectreactor:reactor-test:3.7.8")
       plugin("spring-boot", "org.springframework.boot").versionRef("spring-boot")
     }