[BOOK-304] chore: 사용하지 않는 라이브러리 의존성 제거

Author: easyhooon

gradle/libs.versions.toml

@@ -33,7 +33,6 @@ ksp = "2.2.0-2.0.2"
 kotlin = "2.2.0"
 kotlinx-coroutines = "1.10.2"
 kotlinx-serialization-json = "1.9.0"
-kotlinx-datetime = "0.7.1"
 kotlinx-collections-immutable = "0.4.0"
 
 ## Hilt