Bump com.azure:azure-identity from 1.14.2 to 1.15.0 in /grapheventgrid

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] <support@github.com>

Author: dependabot[bot]

grapheventgrid/build.gradle

@@ -17,7 +17,7 @@ repositories {
 
 dependencies {
   implementation 'org.springframework.boot:spring-boot-starter-web'
-  implementation 'com.azure:azure-identity:1.14.2'
+  implementation 'com.azure:azure-identity:1.15.0'
   implementation 'com.microsoft.graph:microsoft-graph:5.80.0'
   testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }