Bump istio-client from 1.1.1 to 1.5.5 (spring-cloud#589)

Bumps [istio-client](https://github.com/snowdrop/istio-java-api) from 1.1.1 to 1.5.5.
- [Release notes](https://github.com/snowdrop/istio-java-api/releases)
- [Commits](snowdrop/istio-java-api@1.1.1...1.5.5)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Ryan Baxter <[email protected]>

Author: dependabot-preview[bot]

spring-cloud-kubernetes-dependencies/pom.xml

@@ -37,7 +37,7 @@
 		<hoverfly.version>0.13.0</hoverfly.version>
 		<kubernetes-client.version>4.10.3</kubernetes-client.version>
 		<kubernetes-java-client.version>10.0.0</kubernetes-java-client.version>
-		<istio-client.version>1.1.1</istio-client.version>
+		<istio-client.version>1.5.5</istio-client.version>
 		<mockwebserver.version>0.1.2</mockwebserver.version>
 		<okhttp.version>3.14.4</okhttp.version>
 	</properties>