Update atomicfu to v0.28.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -9,7 +9,7 @@ agp = "8.7.2"
 kotlin = "2.1.20"
 publish = "0.30.0"
 api-validator = "0.17.0"
-atomicfu = "0.27.0"
+atomicfu = "0.28.0"
 androidx-activity-compose = "1.10.0"
 kotlinx-serialization-json = "1.8.0"
 kotlinx-coroutines = "1.10.1"