Bump com.microsoft.graph:microsoft-graph in /apps/backend

Bumps [com.microsoft.graph:microsoft-graph](https://github.com/microsoftgraph/msgraph-sdk-java) from 5.79.0 to 6.3.0.
- [Release notes](https://github.com/microsoftgraph/msgraph-sdk-java/releases)
- [Changelog](https://github.com/microsoftgraph/msgraph-sdk-java/blob/dev/CHANGELOG.md)
- [Commits](microsoftgraph/msgraph-sdk-java@v5.79.0...v6.3.0)

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

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

apps/backend/pom.xml

@@ -25,7 +25,7 @@
         <lucene.version>9.9.1</lucene.version>
         <shedlock.version>5.10.2</shedlock.version>
         <commons-collections4.version>4.4</commons-collections4.version>
-        <microsoft-graph.version>5.79.0</microsoft-graph.version>
+        <microsoft-graph.version>6.3.0</microsoft-graph.version>
         <msal4j.version>1.14.2</msal4j.version>
 
         <!-- transitive versions -->