Bump com.azure:azure-messaging-eventhubs in /modules/azure

Bumps [com.azure:azure-messaging-eventhubs](https://github.com/Azure/azure-sdk-for-java) from 5.19.2 to 5.20.4.
- [Release notes](https://github.com/Azure/azure-sdk-for-java/releases)
- [Commits](Azure/azure-sdk-for-java@azure-messaging-eventhubs_5.19.2...azure-messaging-eventhubs_5.20.4)

---
updated-dependencies:
- dependency-name: com.azure:azure-messaging-eventhubs
  dependency-version: 5.20.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

modules/azure/build.gradle

@@ -11,7 +11,7 @@ dependencies {
     testImplementation 'com.azure:azure-storage-blob:12.29.0'
     testImplementation 'com.azure:azure-storage-queue:12.24.0'
     testImplementation 'com.azure:azure-data-tables:12.5.0'
-    testImplementation 'com.azure:azure-messaging-eventhubs:5.19.2'
+    testImplementation 'com.azure:azure-messaging-eventhubs:5.20.4'
     testImplementation 'com.azure:azure-messaging-servicebus:7.17.8'
     testImplementation 'com.microsoft.sqlserver:mssql-jdbc:13.1.0.jre8-preview'
 }