Add stdlib compat to Project.toml (#2310)

Author: odow

Project.toml

@@ -28,11 +28,16 @@ DataStructures = "0.18"
 ForwardDiff = "0.5, 0.6, 0.7, 0.8, 0.9, 0.10"
 JSON = "~0.21"
 JSONSchema = "1"
+LinearAlgebra = "1.6"
 MutableArithmetics = "1"
 NaNMath = "0.3, 1"
 OrderedCollections = "1"
 PrecompileTools = "1"
+Printf = "1.6"
+SparseArrays = "1.6"
 SpecialFunctions = "0.8, 1, 2"
+Test = "1.6"
+Unicode = "1.6"
 julia = "1.6"
 
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