Update filter extenion json schema in client.py (#836)

* Update filter extenion json schema in client.py

to be compliant with:
https://docs.ogc.org/is/19-079r2/19-079r2.html#queryables

* update BaseFiltersClient

* update changelog

---------

Co-authored-by: vincentsarago <[email protected]>

Author: j-musial

CHANGES.md

@@ -7,6 +7,7 @@
 - avoid future deprecation for pydantic.Field and use `json_schema_extra` instead of `openapi_examples`
 - use `orjson` based JSONResponse when available
 - changed from `AssertionError` to `HTTPException` for **bbox** parsing exceptions
+- update `$schema` in Filter's extension client responses to match OGC Feature specification
 
 ### Added
 

stac_fastapi/extensions/stac_fastapi/extensions/core/filter/client.py

@@ -23,7 +23,7 @@ async def get_queryables(
         https://github.com/radiantearth/stac-api-spec/tree/master/fragments/filter#queryables
         """
         return {
-            "$schema": "https://json-schema.org/draft/2019-09/schema",
+            "$schema": "https://json-schema.org/draft/2020-12/schema",
             "$id": "https://example.org/queryables",
             "type": "object",
             "title": "Queryables for Example STAC API",
@@ -49,7 +49,7 @@ def get_queryables(
         https://github.com/stac-api-extensions/filter#queryables
         """
         return {
-            "$schema": "https://json-schema.org/draft/2019-09/schema",
+            "$schema": "https://json-schema.org/draft/2020-12/schema",
             "$id": "https://example.org/queryables",
             "type": "object",
             "title": "Queryables for Example STAC API",