Remove arbitrary string length limits

PyUnicode_FromFormat() and PyErr_Format() allocates a buffer of the needed
size, it is no more a fixed-buffer of 500 bytes.
diff --git a/Objects/codeobject.c b/Objects/codeobject.c
index e9cae13..bb938ea 100644
--- a/Objects/codeobject.c
+++ b/Objects/codeobject.c
@@ -347,11 +347,11 @@
         lineno = -1;
     if (co->co_filename && PyUnicode_Check(co->co_filename)) {
         return PyUnicode_FromFormat(
-            "<code object %.100U at %p, file \"%.300U\", line %d>",
+            "<code object %U at %p, file \"%U\", line %d>",
             co->co_name, co, co->co_filename, lineno);
     } else {
         return PyUnicode_FromFormat(
-            "<code object %.100U at %p, file ???, line %d>",
+            "<code object %U at %p, file ???, line %d>",
             co->co_name, co, lineno);
     }
 }