Unskip temporal open window test (#254)

**Related Issue(s):**

- #

**Description:**


**PR Checklist:**

- [x] Code is formatted and linted (run `pre-commit run --all-files`)
- [x] Tests pass (run `make test`)
- [x] Documentation has been updated to reflect changes, if applicable
- [x] Changes are added to the changelog

Author: jonhealy1

CHANGELOG.md

@@ -9,9 +9,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Changed
 
+- Unskip temporal open window test [#254](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/254)
 - Removed deprecated context extension [#255](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/255)
 
-
 ## [v3.0.0a0]
 
 ### Added

stac_fastapi/tests/resources/test_item.py

@@ -393,7 +393,6 @@ async def test_item_search_temporal_window_post(app_client, ctx, load_test_data)
 
 
 @pytest.mark.asyncio
-@pytest.mark.skip(reason="KeyError: 'features")
 async def test_item_search_temporal_open_window(app_client, ctx):
     """Test POST search with open spatio-temporal query (core)"""
     test_item = ctx.item