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

Bumps [com.microsoft.graph:microsoft-graph](https://github.com/microsoftgraph/msgraph-sdk-java) from 6.25.1 to 6.26.0.
- [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@v6.25.1...v6.26.0)

---
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]>

apps/backend/pom.xml

@@ -24,7 +24,7 @@
         <lucene.version>10.1.0</lucene.version>
         <shedlock.version>5.13.0</shedlock.version>     <!-- bytte ut med bruk av Leader Elecctor ? -->
         <commons-collections4.version>4.4</commons-collections4.version>
-        <microsoft-graph.version>6.25.1</microsoft-graph.version>
+        <microsoft-graph.version>6.26.0</microsoft-graph.version>
         <msal4j.version>1.18.0</msal4j.version>
 
         <!-- transitive versions -->