Upgrade pypgstac_version. (#16)

Author: sharkinsspatial

lib/ingestor-api/runtime/requirements.txt

@@ -6,9 +6,7 @@ orjson>=3.6.8
 psycopg[binary,pool]>=3.0.15
 pydantic_ssm_settings>=0.2.0
 pydantic>=1.9.0
-# Waiting for https://github.com/stac-utils/pgstac/pull/135
-# pypgstac==0.6.6
-pypgstac @ git+https://github.com/stac-utils/pgstac.git@main#egg=pygstac&subdirectory=pypgstac
+pypgstac==0.6.8
 requests>=2.27.1
 # Waiting for https://github.com/stac-utils/stac-pydantic/pull/116
 stac-pydantic @ git+https://github.com/alukach/stac-pydantic.git@patch-1