Update jsonschema to keep up with other tools

setup.py

@@ -41,7 +41,7 @@ def find_version(*file_paths):
         "boto3>=1.10.20",
         "Jinja2>=3.1.2",
         "markupsafe>=2.1.0",
-        "jsonschema>=3.0.1,<4.0",
+        "jsonschema>=4.0.0,<5.0",
         "pytest>=4.5.0",
         "pytest-random-order>=1.0.4",
         "pytest-localserver>=0.5.0",

src/rpdk/core/jsonutils/inliner.py

@@ -26,6 +26,13 @@ def __init__(self, base_uri, schema):
     def _walk_schema(self):
         self._walk(self.schema, (BASE,))
 
+    def resolve(self, ref):
+        """
+        Resolve the given reference.
+        """
+        url = self._urljoin_cache(self.resolution_scope, ref)
+        return url, self._remote_cache(url)
+
     def _walk(self, obj, old_path):
         if isinstance(obj, str):
             return  # very common, easier to debug this case

src/rpdk/core/jsonutils/renamer.py

@@ -1,6 +1,5 @@
 from itertools import count
-
-from jsonschema.compat import urldefrag
+from urllib.parse import urldefrag
 
 from .pointer import fragment_decode