fix(solana): use smaller batch "append instruction" chunk size (#384)

Author: gustavogama-cll

.changeset/five-bobcats-wave.md

@@ -0,0 +1,5 @@
+---
+"@smartcontractkit/mcms": patch
+---
+
+fix(solana): use smaller batch "append instruction" chunk size

sdk/solana/timelock_converter.go

@@ -18,9 +18,9 @@ import (
 	"github.com/smartcontractkit/mcms/types"
 )
 
-// AppendIxDataChunkSize number is derived from chainlink-ccip
-// https://github.com/smartcontractkit/chainlink-ccip/blob/main/chains/solana/contracts/tests/config/timelock_config.go#L20
-const AppendIxDataChunkSize = 491
+// AppendIxDataChunkSize number is derived from chainlink-ccip; using 400 as
+// recommended by jonghyeon.park@smartcontract.com.
+const AppendIxDataChunkSize = 400
 
 var _ sdk.TimelockConverter = (*TimelockConverter)(nil)