Revert "undo inference change"

This reverts commit c095cd4.

Author: simonjayhawkins

pandas/_libs/lib.pyx

@@ -1110,7 +1110,7 @@ _TYPE_MAP = {
     "complex64": "complex",
     "complex128": "complex",
     "c": "complex",
-    "string": "string",
+    str: "string",
     "S": "bytes",
     "U": "string",
     "bool": "boolean",

pandas/tests/dtypes/test_inference.py

@@ -1267,9 +1267,9 @@ def test_interval(self):
     @pytest.mark.parametrize("klass", [pd.array, Series])
     @pytest.mark.parametrize("skipna", [True, False])
     @pytest.mark.parametrize("data", [["a", "b", "c"], ["a", "b", pd.NA]])
-    def test_string_dtype(self, data, skipna, klass):
+    def test_string_dtype(self, data, skipna, klass, nullable_string_dtype):
         # StringArray
-        val = klass(data, dtype="string")
+        val = klass(data, dtype=nullable_string_dtype)
         inferred = lib.infer_dtype(val, skipna=skipna)
         assert inferred == "string"