Allow LazyArrays v1 (#324)

Needed for Julia v1.6

Author: blegat

Project.toml

@@ -20,7 +20,7 @@ BlockDiagonals = "0.1"
 ChainRulesCore = "1"
 IterativeSolvers = "0.9"
 JuMP = "1"
-LazyArrays = "2"
+LazyArrays = "1, 2"
 MathOptInterface = "1.18"
 MathOptSetDistances = "0.2.9"
 ParametricOptInterface = "0.14"