Bump pulsar-reactive from 0.5.5 to 0.5.6 (#701)

Bumps `pulsar-reactive` from 0.5.5 to 0.5.6.

Updates `org.apache.pulsar:pulsar-client-reactive-api` from 0.5.5 to 0.5.6
- [Release notes](https://github.com/apache/pulsar-client-reactive/releases)
- [Commits](https://github.com/apache/pulsar-client-reactive/compare/v0.5.5...v0.5.6)

Updates `org.apache.pulsar:pulsar-client-reactive-adapter` from 0.5.5 to 0.5.6
- [Release notes](https://github.com/apache/pulsar-client-reactive/releases)
- [Commits](https://github.com/apache/pulsar-client-reactive/compare/v0.5.5...v0.5.6)

Updates `org.apache.pulsar:pulsar-client-reactive-producer-cache-caffeine-shaded` from 0.5.5 to 0.5.6
- [Release notes](https://github.com/apache/pulsar-client-reactive/releases)
- [Commits](https://github.com/apache/pulsar-client-reactive/compare/v0.5.5...v0.5.6)

---
updated-dependencies:
- dependency-name: org.apache.pulsar:pulsar-client-reactive-api
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.apache.pulsar:pulsar-client-reactive-adapter
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.apache.pulsar:pulsar-client-reactive-producer-cache-caffeine-shaded
  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>

gradle/libs.versions.toml

@@ -10,7 +10,7 @@ micrometer-docs-gen = "1.0.2"
 micrometer-tracing = "1.3.1"
 protobuf = "3.25.3"
 pulsar = "3.2.3"
-pulsar-reactive = "0.5.5"
+pulsar-reactive = "0.5.6"
 reactor = "2023.0.6"
 spring = "6.1.9"
 # tests