bpo-37120: Fix _ssl get_num_tickets() (GH-14668)

Replace PyLong_FromLong() with PyLong_FromSize_t():
SSL_CTX_get_num_tickets() return type is size_t.

https://bugs.python.org/issue37120
(cherry picked from commit 76611c7)

Co-authored-by: Victor Stinner <[email protected]>

Author: miss-islington

Modules/_ssl.c

@@ -3641,7 +3641,7 @@ set_maximum_version(PySSLContext *self, PyObject *arg, void *c)
 static PyObject *
 get_num_tickets(PySSLContext *self, void *c)
 {
-    return PyLong_FromLong(SSL_CTX_get_num_tickets(self->ctx));
+    return PyLong_FromSize_t(SSL_CTX_get_num_tickets(self->ctx));
 }
 
 static int