Bump com.azure:azure-identity in /user-auth/graphtutorial

Bumps [com.azure:azure-identity](https://github.com/Azure/azure-sdk-for-java) from 1.14.2 to 1.15.0.
- [Release notes](https://github.com/Azure/azure-sdk-for-java/releases)
- [Commits](Azure/azure-sdk-for-java@azure-identity_1.14.2...azure-core_1.15.0)

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

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

user-auth/graphtutorial/app/build.gradle

@@ -23,7 +23,7 @@ dependencies {
 
     // This dependency is used by the application.
     implementation 'com.google.guava:guava:33.4.0-jre'
-    implementation 'com.azure:azure-identity:1.14.2'
+    implementation 'com.azure:azure-identity:1.15.0'
     implementation 'com.microsoft.graph:microsoft-graph:6.25.1'
 }
 // </DependenciesSnippet>