Bump pulsar-client from 2.5.2 to 2.6.0 in /modules/pulsar (#2893)

Bumps [pulsar-client](https://github.com/apache/pulsar) from 2.5.2 to 2.6.0.
- [Release notes](https://github.com/apache/pulsar/releases)
- [Commits](apache/pulsar@v2.5.2...v2.6.0)

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

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

Author: dependabot-preview[bot]

modules/pulsar/build.gradle

@@ -3,6 +3,6 @@ description = "Testcontainers :: Pulsar"
 dependencies {
     compile project(':testcontainers')
 
-    testCompile group: 'org.apache.pulsar', name: 'pulsar-client', version: '2.5.2'
+    testCompile group: 'org.apache.pulsar', name: 'pulsar-client', version: '2.6.0'
     testCompile group: 'org.assertj', name: 'assertj-core', version: '3.16.1'
 }