add JSON v1 compat (#208)

Author: m-fila

Project.toml

@@ -31,7 +31,7 @@ CodecZlib = "0.7"
 CodecZstd = "0.8"
 EDM4hep = "0.4.0"
 EnumX = "1.0.4"
-JSON = "0.21"
+JSON = "0.21, 1.2"
 Logging = "1.9"
 LoopVectorization = "0.12.170"
 LorentzVectorHEP = "0.1.6"