Bump java-client from 2.7.3 to 2.7.4 in /modules/couchbase (#1275)

Bumps [java-client](https://github.com/couchbase/couchbase-java-client) from 2.7.3 to 2.7.4.
<details>
<summary>Commits</summary>

- [`e759d32`](couchbase/couchbase-java-client@e759d32) Prepare 2.7.4 release
- [`588dde8`](couchbase/couchbase-java-client@588dde8) JCBC-1292 Fix OSGi to export only java-client package
- [`8392859`](couchbase/couchbase-java-client@8392859) Start 2.7.4 development
- See full diff in [compare view](couchbase/couchbase-java-client@2.7.3...2.7.4)
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modules/couchbase/build.gradle

@@ -2,5 +2,5 @@ description = "Testcontainers :: Couchbase"
 
 dependencies {
     compile project(':testcontainers')
-    compile 'com.couchbase.client:java-client:2.7.3'
+    compile 'com.couchbase.client:java-client:2.7.4'
 }