Bump com.azure:azure-identity from 1.11.4 to 1.12.0 in /apps/backend

Bumps [com.azure:azure-identity](https://github.com/Azure/azure-sdk-for-java) from 1.11.4 to 1.12.0.
- [Release notes](https://github.com/Azure/azure-sdk-for-java/releases)
- [Commits](Azure/azure-sdk-for-java@azure-identity_1.11.4...azure-core_1.12.0)

---
updated-dependencies:
- dependency-name: com.azure:azure-identity
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

apps/backend/pom.xml

@@ -142,7 +142,7 @@
         <dependency>
             <groupId>com.azure</groupId>
             <artifactId>azure-identity</artifactId>
-            <version>1.11.4</version>
+            <version>1.12.0</version>
         </dependency>
         <dependency>
             <groupId>com.microsoft.azure</groupId>