build(deps): bump com.microsoft.graph:microsoft-graph in /graphwebhook

Bumps [com.microsoft.graph:microsoft-graph](https://github.com/microsoftgraph/msgraph-sdk-java) from 6.27.0 to 6.28.0.
- [Release notes](https://github.com/microsoftgraph/msgraph-sdk-java/releases)
- [Changelog](https://github.com/microsoftgraph/msgraph-sdk-java/blob/main/CHANGELOG.md)
- [Commits](microsoftgraph/msgraph-sdk-java@v6.27.0...v6.28.0)

---
updated-dependencies:
- dependency-name: com.microsoft.graph:microsoft-graph
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

graphwebhook/pom.xml

@@ -56,7 +56,7 @@
 		<dependency>
 			<groupId>com.microsoft.graph</groupId>
 			<artifactId>microsoft-graph</artifactId>
-			<version>6.27.0</version>
+			<version>6.28.0</version>
 		</dependency>
 
 		<dependency>