Fix the stdlib compat entries (JuliaPy#1065)

Author: DilumAluthge

Project.toml

@@ -18,10 +18,10 @@ MacroTools = "0.4, 0.5"
 VersionParsing = "1.0"
 
 julia = "1.4"
-Dates = "1.4"
-Libdl = "1.4"
-LinearAlgebra = "1.4"
-Serialization = "1.4"
+Dates = "<0.0.1, 1"
+Libdl = "<0.0.1, 1"
+LinearAlgebra = "<0.0.1, 1"
+Serialization = "<0.0.1, 1"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"