fix: chaning max attestations for devnet4 test vectors

Author: Sahilgill24

testing/lean-spec-tests/src/fork_choice.rs

@@ -43,7 +43,7 @@ use crate::types::{
 };
 
 #[cfg(feature = "devnet4")]
-const DEVNET4_MAX_BLOCK_ATTESTATIONS: usize = 8;
+const DEVNET4_MAX_BLOCK_ATTESTATIONS: usize = 16;
 
 /// Load a fork choice test fixture from a JSON file
 pub fn load_fork_choice_test(