Bump the version of jsonschema (#1556)

* Bump the version of jsonschema

OpenAPI 3.1 uses JSON Schema Draft 2020-12 so we need a version that
supports it.

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

* Add changelog

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

* Fix PR number

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

---------

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

changelogs/internal/newsfragments/1556.clarification

@@ -0,0 +1 @@
+Bump jsonschema to validate JSON Schemas against Draft 2020-12.

scripts/check-event-schema-examples.py

@@ -88,7 +88,7 @@ def check_example_file(examplepath, schemapath):
 
     fileurl = "file://" + os.path.abspath(schemapath)
     schema["id"] = fileurl
-    resolver = jsonschema.RefResolver(schemapath, schema, handlers={"file": load_file})
+    resolver = jsonschema.RefResolver(fileurl, schema, handlers={"file": load_file})
 
     print ("Checking schema for: %r %r" % (examplepath, schemapath))
     try:

scripts/requirements.txt

@@ -1,9 +1,8 @@
 # no doubt older versions would be fine for many of these but these were
 # current at the time of writing
 
-# jsonschema 3.0.0 objects to the $refs in our schema file. TODO: figure out
-# why.
-jsonschema >= 2.6.0, < 3.0.0
+# we need at least version 4.0.0 for support of JSON Schema Draft 2020-12.
+jsonschema >= 4.0.0
 
 PyYAML >= 3.12
 requests >= 2.18.4