Remove deprecated get_operation_root_type

Replicates graphql/graphql-js@0c315b6

Author: Cito

docs/modules/utilities.rst

@@ -18,10 +18,6 @@ Get the target Operation from a Document:
 
 .. autofunction:: get_operation_ast
 
-Get the Type for the target Operation AST:
-
-.. autofunction:: get_operation_root_type
-
 Convert a GraphQLSchema to an IntrospectionQuery:
 
 .. autofunction:: introspection_from_schema

src/graphql/__init__.py

@@ -167,8 +167,6 @@
     IntrospectionQuery,
     # Get the target Operation from a Document.
     get_operation_ast,
-    # Get the Type for the target Operation AST.
-    get_operation_root_type,
     # Convert a GraphQLSchema to an IntrospectionQuery.
     introspection_from_schema,
     # Build a GraphQLSchema from an introspection result.
@@ -744,7 +742,6 @@
     "get_introspection_query",
     "IntrospectionQuery",
     "get_operation_ast",
-    "get_operation_root_type",
     "introspection_from_schema",
     "build_client_schema",
     "build_ast_schema",

src/graphql/utilities/__init__.py

@@ -10,9 +10,6 @@
 # Get the target Operation from a Document.
 from .get_operation_ast import get_operation_ast
 
-# Get the Type for the target Operation AST.
-from .get_operation_root_type import get_operation_root_type
-
 # Convert a GraphQLSchema to an IntrospectionQuery.
 from .introspection_from_schema import introspection_from_schema
 
@@ -106,7 +103,6 @@
     "find_dangerous_changes",
     "get_introspection_query",
     "get_operation_ast",
-    "get_operation_root_type",
     "is_equal_type",
     "is_type_sub_type_of",
     "is_valid_name_error",