Bump com.couchbase.client:java-client in /modules/couchbase

Bumps [com.couchbase.client:java-client](https://github.com/couchbase/couchbase-jvm-clients) from 3.9.0 to 3.9.1.
- [Commits](couchbase/couchbase-jvm-clients@3.9.0...3.9.1)

---
updated-dependencies:
- dependency-name: com.couchbase.client:java-client
  dependency-version: 3.9.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

modules/couchbase/build.gradle

@@ -8,7 +8,7 @@ dependencies {
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher:1.11.0'
 
     testImplementation 'org.junit.jupiter:junit-jupiter:5.13.4'
-    testImplementation 'com.couchbase.client:java-client:3.9.0'
+    testImplementation 'com.couchbase.client:java-client:3.9.1'
     testImplementation 'org.awaitility:awaitility:4.3.0'
     testImplementation 'org.assertj:assertj-core:3.27.4'
 }