Bump realm-gradle-plugin from 10.3.1 to 10.4.0

Bumps [realm-gradle-plugin](https://github.com/realm/realm-java) from 10.3.1 to 10.4.0.
- [Release notes](https://github.com/realm/realm-java/releases)
- [Changelog](https://github.com/realm/realm-java/blob/master/CHANGELOG.md)
- [Commits](https://github.com/realm/realm-java/compare/v10.3.1...v10.4.0)

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

matrix-sdk-android/build.gradle

@@ -9,7 +9,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath "io.realm:realm-gradle-plugin:10.3.1"
+        classpath "io.realm:realm-gradle-plugin:10.4.0"
     }
 }