Temporary fix for RecursiveVec change (#187)

Author: lkdvos

Project.toml

@@ -26,7 +26,7 @@ Accessors = "0.1"
 FLoops = "0.1, 0.2"
 FastClosures = "0.3"
 FoldsThreads = "0.1"
-KrylovKit = "0.8.1"
+KrylovKit = "=0.8.1"
 LinearAlgebra = "1.6"
 LoggingExtras = "1"
 OptimKit = "0.3.1"