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

Bumps [com.microsoft.graph:microsoft-graph](https://github.com/microsoftgraph/msgraph-sdk-java) from 6.20.0 to 6.22.0.
- [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@v6.20.0...v6.22.0)

---
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

@@ -25,7 +25,7 @@
         <graphql-spring-boot-starter.version>15.1.0</graphql-spring-boot-starter.version>
         <graphql.version>22.0</graphql.version>
         <flexmark.version>0.64.8</flexmark.version>
-        <microsoft-graph.version>6.20.0</microsoft-graph.version>
+        <microsoft-graph.version>6.22.0</microsoft-graph.version>
         <msal4j.version>1.17.3</msal4j.version>
         <flyway-database-postgresql.version>10.16.0</flyway-database-postgresql.version>