Upgrade pystac to avoid json-schema errors

Item validation at version 1.7.* seems to have been broken due to
changes in the github.com hosted GeoJSON Geometry json-schema file.
Later versions seem to have vendored this file and are not affected by
the change.

pcstac/requirements.txt

@@ -2,7 +2,7 @@
 # This file is autogenerated by pip-compile with Python 3.9
 # by the following command:
 #
-#    pip-compile --extra=server --output-file=pcstac/requirements.txt --resolver=backtracking pccommon/setup.py pcstac/setup.py
+#    pip-compile --extra=server --output-file=pcstac/requirements.txt pccommon/setup.py pcstac/setup.py
 #
 anyio==3.6.2
     # via
@@ -177,7 +177,7 @@ pypgstac[psycopg]==0.7.3
     # via
     #   pcstac (pcstac/setup.py)
     #   stac-fastapi-pgstac
-pystac==1.7.1
+pystac==1.9.0
     # via
     #   pcstac (pcstac/setup.py)
     #   stac-fastapi-types

pcstac/setup.py

@@ -10,7 +10,7 @@
     "stac-fastapi.types==2.4.5",
     # Required due to some imports related to pypgstac CLI usage in startup script
     "pypgstac[psycopg]~=0.7",
-    "pystac==1.*",
+    "pystac>=1.8,<2.0",
 ]
 
 extra_reqs = {