Issue #28765: _sre.compile() now checks the type of groupindex and indexgroup

groupindex must a dictionary and indexgroup must be a tuple.

Previously, indexgroup was a list. Use a tuple to reduce the memory usage.

Modules/sre.h

@@ -27,8 +27,8 @@
 typedef struct {
     PyObject_VAR_HEAD
     Py_ssize_t groups; /* must be first! */
-    PyObject* groupindex;
-    PyObject* indexgroup;
+    PyObject* groupindex; /* dict */
+    PyObject* indexgroup; /* tuple */
     /* compatibility */
     PyObject* pattern; /* pattern source (or None) */
     int flags; /* flags used when compiling pattern source */