bpo-42519: Replace PyMem_MALLOC() with PyMem_Malloc() (GH-23586)

No longer use deprecated aliases to functions:

* Replace PyMem_MALLOC() with PyMem_Malloc()
* Replace PyMem_REALLOC() with PyMem_Realloc()
* Replace PyMem_FREE() with PyMem_Free()
* Replace PyMem_Del() with PyMem_Free()
* Replace PyMem_DEL() with PyMem_Free()

Modify also the PyMem_DEL() macro to use directly PyMem_Free().
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index 6f799ee..87fe3a1 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -3306,10 +3306,10 @@ context_dealloc(PySSLContext *self)
     context_clear(self);
     SSL_CTX_free(self->ctx);
 #if HAVE_NPN
-    PyMem_FREE(self->npn_protocols);
+    PyMem_Free(self->npn_protocols);
 #endif
 #if HAVE_ALPN
-    PyMem_FREE(self->alpn_protocols);
+    PyMem_Free(self->alpn_protocols);
 #endif
     Py_TYPE(self)->tp_free(self);
     Py_DECREF(tp);
@@ -3510,7 +3510,7 @@ _ssl__SSLContext__set_alpn_protocols_impl(PySSLContext *self,
         return NULL;
     }
 
-    PyMem_FREE(self->alpn_protocols);
+    PyMem_Free(self->alpn_protocols);
     self->alpn_protocols = PyMem_Malloc(protos->len);
     if (!self->alpn_protocols)
         return PyErr_NoMemory();