Bump amqp-client from 5.5.1 to 5.5.2 in /core (#1122)

Bumps [amqp-client](https://github.com/rabbitmq/rabbitmq-java-client) from 5.5.1 to 5.5.2.
<details>
<summary>Release notes</summary>

*Sourced from [amqp-client's releases](https://github.com/rabbitmq/rabbitmq-java-client/releases).*

> ## 5.5.2
> This is a patch release with a bug fix. All users of the 5.x.x series are encouraged to upgrade to this version.
> 
> Thanks to Andrew Steinborn for his contribution on this release.
> 
> # Changes between 5.5.1 and 5.5.2
> 
> ## Spurious warnings emitted by ClientVersion when the library is relocated
> 
> GitHub issue: [#436](https://github-redirect.dependabot.com/rabbitmq/rabbitmq-java-client/issues/436) 
</details>
<details>
<summary>Changelog</summary>

*Sourced from [amqp-client's changelog](https://github.com/rabbitmq/rabbitmq-java-client/blob/v5.5.2/release-versions.txt).*

> RELEASE_VERSION="5.5.2"
> DEVELOPMENT_VERSION="5.5.3-SNAPSHOT"
</details>
<details>
<summary>Commits</summary>

- [`0310c49`](rabbitmq/rabbitmq-java-client@0310c49) [maven-release-plugin] prepare release v5.5.2
- [`5835658`](rabbitmq/rabbitmq-java-client@5835658) Set release version to 5.5.2
- [`d2e12e1`](rabbitmq/rabbitmq-java-client@d2e12e1) Add link to issue in comment
- [`f2470e0`](rabbitmq/rabbitmq-java-client@f2470e0) Fix warnings in ClientVersion when amqp-client is relocated
- [`1eb5590`](rabbitmq/rabbitmq-java-client@1eb5590) Increase expiry epsilon in dead letter test
- [`d67b90d`](rabbitmq/rabbitmq-java-client@d67b90d) Set release version to 5.5.2.RC1
- [`7157d43`](rabbitmq/rabbitmq-java-client@7157d43) [maven-release-plugin] prepare for next development iteration
- See full diff in [compare view](rabbitmq/rabbitmq-java-client@v5.5.1...v5.5.2)
</details>
<br />

[![Dependabot compatibility score](https://api.dependabot.com/badges/compatibility_score?dependency-name=com.rabbitmq:amqp-client&package-manager=gradle&previous-version=5.5.1&new-version=5.5.2)](https://dependabot.com/compatibility-score.html?dependency-name=com.rabbitmq:amqp-client&package-manager=gradle&previous-version=5.5.1&new-version=5.5.2)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot badge me` will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in the `.dependabot/config.yml` file in this repo:
- Update frequency (including time of day and day of week)
- Automerge options (never/patch/minor, and dev/runtime dependencies)
- Pull request limits (per update run and/or open at any time)
- Out-of-range updates (receive only lockfile updates, if desired)
- Security updates (receive only security updates, if desired)

Finally, you can contact us by mentioning @dependabot.

</details>

core/build.gradle

@@ -118,7 +118,7 @@ dependencies {
     }
 
     testCompile 'redis.clients:jedis:3.0.1'
-    testCompile 'com.rabbitmq:amqp-client:5.5.1'
+    testCompile 'com.rabbitmq:amqp-client:5.5.2'
     testCompile 'org.mongodb:mongo-java-driver:3.9.1'
     testCompile ('org.mockito:mockito-core:2.23.4') {
         exclude(module: 'hamcrest-core')