Add support for fourfold nested lists in introspection

Replicates graphql/graphql-js@826ae7f

src/graphql/utilities/get_introspection_query.py

@@ -149,6 +149,14 @@ def input_deprecation(string: str) -> str | None:
                       ofType {{
                         kind
                         name
+                        ofType {{
+                          kind
+                          name
+                          ofType {{
+                            kind
+                            name
+                          }}
+                        }}
                       }}
                     }}
                   }}

tests/utilities/test_build_client_schema.py

@@ -991,11 +991,11 @@ def throws_when_missing_directive_args():
                 build_client_schema(introspection)
 
     def describe_very_deep_decorators_are_not_supported():
-        def fails_on_very_deep_lists_more_than_7_levels():
+        def fails_on_very_deep_lists_more_than_8_levels():
             schema = build_schema(
                 """
                 type Query {
-                  foo: [[[[[[[[String]]]]]]]]
+                  foo: [[[[[[[[[[String]]]]]]]]]]
                 }
                 """
             )
@@ -1010,11 +1010,11 @@ def fails_on_very_deep_lists_more_than_7_levels():
                 " Decorated type deeper than introspection query."
             )
 
-        def fails_on_a_very_deep_non_null_more_than_7_levels():
+        def fails_on_a_very_deep_more_than_8_levels_non_null():
             schema = build_schema(
                 """
                 type Query {
-                  foo: [[[[String!]!]!]!]
+                  foo: [[[[[String!]!]!]!]!]
                 }
                 """
             )
@@ -1029,12 +1029,12 @@ def fails_on_a_very_deep_non_null_more_than_7_levels():
                 " Decorated type deeper than introspection query."
             )
 
-        def succeeds_on_deep_types_less_or_equal_7_levels():
-            # e.g., fully non-null 3D matrix
+        def succeeds_on_deep_less_or_equal_8_levels_types():
+            # e.g., fully non-null 4D matrix
             sdl = dedent(
                 """
                 type Query {
-                  foo: [[[String!]!]!]!
+                  foo: [[[[String!]!]!]!]!
                 }
                 """
             )