bpo-40958: Avoid 'possible loss of data' warning on Windows (GH-20970)

(cherry picked from commit 861efc6e8fe7f030b1e193989b13287b31385939)

Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>
diff --git a/Parser/pegen/pegen.h b/Parser/pegen/pegen.h
index e459fc5..1c038ab 100644
--- a/Parser/pegen/pegen.h
+++ b/Parser/pegen/pegen.h
@@ -34,7 +34,7 @@
 typedef struct {
     int type;
     PyObject *bytes;
-    Py_ssize_t lineno, col_offset, end_lineno, end_col_offset;
+    int lineno, col_offset, end_lineno, end_col_offset;
     Memo *memo;
 } Token;