change import

Signed-off-by: martinvuyk <[email protected]>

stdlib/src/builtin/string_literal.mojo

@@ -17,11 +17,16 @@ These are Mojo built-ins, so you don't need to import them.
 
 from collections import List
 from collections.string.format import _CurlyEntryFormattable, _FormatCurlyEntry
-from collections.string.string_slice import _StringSliceIter, _to_string_list
+from collections.string.string_slice import (
+    StringSlice,
+    StaticString,
+    _StringSliceIter,
+    _to_string_list,
+)
 from hashlib._hasher import _HashableWithHasher, _Hasher
 from memory import UnsafePointer, memcpy, Span
 from sys.ffi import c_char
-from utils import StaticString, StringSlice, Writable, Writer
+from utils import Writable, Writer
 from utils._visualizers import lldb_formatter_wrapping_type