Bump fastcomments-java to fix memory leak

Author: winrid

gradle/libs.versions.toml

@@ -10,7 +10,7 @@ activityCompose = "1.8.0"
 composeBom = "2024.04.01"
 appcompat = "1.7.0"
 material = "1.12.0"
-fastcomments = "0.0.20"
+fastcomments = "0.0.21"
 constraintlayout = "2.1.4"
 swiperefreshlayout = "1.1.0"