Reduce the default number of epochs to retain beacon states in state cache to 8

Author: povi

fork_choice_store/src/store_config.rs

@@ -10,7 +10,7 @@ pub const DEFAULT_CACHE_LOCK_TIMEOUT_MILLIS: u64 = 1500;
 pub struct StoreConfig {
     #[derivative(Default(value = "32"))]
     pub max_empty_slots: u64,
-    #[derivative(Default(value = "64"))]
+    #[derivative(Default(value = "8"))]
     pub max_epochs_to_retain_states_in_cache: u64,
     #[derivative(Default(value = "Duration::from_millis(DEFAULT_CACHE_LOCK_TIMEOUT_MILLIS)"))]
     pub state_cache_lock_timeout: Duration,