Bump com.azure:azure-core in /plugins/repository-azure

Bumps [com.azure:azure-core](https://github.com/Azure/azure-sdk-for-java) from 1.39.0 to 1.42.0.
- [Release notes](https://github.com/Azure/azure-sdk-for-java/releases)
- [Commits](Azure/azure-sdk-for-java@azure-core_1.39.0...azure-core_1.42.0)

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

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

plugins/repository-azure/build.gradle

@@ -44,7 +44,7 @@ opensearchplugin {
 }
 
 dependencies {
-  api 'com.azure:azure-core:1.39.0'
+  api 'com.azure:azure-core:1.42.0'
   api 'com.azure:azure-json:1.0.1'
   api 'com.azure:azure-storage-common:12.21.2'
   api 'com.azure:azure-core-http-netty:1.12.8'