Bump io.realm:realm-gradle-plugin from 10.11.1 to 10.15.1

Bumps [io.realm:realm-gradle-plugin](https://github.com/realm/realm-java) from 10.11.1 to 10.15.1.
- [Release notes](https://github.com/realm/realm-java/releases)
- [Changelog](https://github.com/realm/realm-java/blob/main/CHANGELOG.md)
- [Commits](realm/realm-java@v10.11.1...v10.15.1)

---
updated-dependencies:
- dependency-name: io.realm:realm-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

matrix-sdk-android/build.gradle

@@ -17,7 +17,7 @@ buildscript {
         }
     }
     dependencies {
-        classpath "io.realm:realm-gradle-plugin:10.11.1"
+        classpath "io.realm:realm-gradle-plugin:10.15.1"
     }
 }