PYCBC-1755: Update JSONType type hint to adhere to static typing standards

Changes
-------
* Change `JSONType` hint to use `Mapping` instead of `Dict` and
  `Sequence` instead of `List`

Change-Id: Iea87189e1d20010d4fc23da98e7cc5d0c7cbf286
Reviewed-on: https://review.couchbase.org/c/couchbase-python-client/+/242353
Reviewed-by: Dimitris Christodoulou <dimitris.christodoulou@couchbase.com>
Tested-by: Build Bot <build@couchbase.com>

Author: thejcfactor

couchbase/_utils.py

@@ -23,6 +23,8 @@
                     Callable,
                     Dict,
                     List,
+                    Mapping,
+                    Sequence,
                     Tuple,
                     Type,
                     TypeVar,
@@ -33,7 +35,7 @@
 from couchbase.logic.pycbc_core import pycbc_exception
 
 JSONType = Union[str, int, float, bool,
-                 None, Dict[str, Any], List[Any]]
+                 None, Mapping[str, Any], Sequence[Any]]
 
 
 def is_null_or_empty(