Relax simplejson dependency and keep it backwards compatible (#152)

Simplejson had a breaking change from 3.18.4 (existing) going to
3.19 where the default behaviour of the JSONEncoder changed with
respect to NaN handling. We address that in a backwards compatible
way by passing `allow_nan=True`.

Author: PartiallyUntyped

awslambdaric/lambda_runtime_marshaller.py

@@ -16,9 +16,9 @@
 class Encoder(json.JSONEncoder):
     def __init__(self):
         if os.environ.get("AWS_EXECUTION_ENV") == "AWS_Lambda_python3.12":
-            super().__init__(use_decimal=False, ensure_ascii=False)
+            super().__init__(use_decimal=False, ensure_ascii=False, allow_nan=True)
         else:
-            super().__init__(use_decimal=False)
+            super().__init__(use_decimal=False, allow_nan=True)
 
     def default(self, obj):
         if isinstance(obj, decimal.Decimal):

requirements/base.txt

@@ -1 +1 @@
-simplejson==3.18.4
+simplejson>=3.18.4