Fix memory leak where Python object refcount not decremented.

Author: GrahamDumpleton

docs/release-notes/version-5.0.1.rst

@@ -12,3 +12,5 @@ Bugs Fixed
 * Fix issue which could result in process crashing when values were supplied
   for user/password/realm of HTTP basic authentication which weren't compliant
   with UTF-8 encoding format.
+
+* Fix memory leak in `check_password()` authentication hook handler.

src/server/mod_wsgi.c

@@ -14926,6 +14926,7 @@ static authn_status wsgi_check_password(request_rec *r, const char *user,
                         if (str) {
                             adapter->r->user = apr_pstrdup(adapter->r->pool,
                                     PyString_AsString(str));
+                            Py_DECREF(str);
 
                             status = AUTH_GRANTED;
                         }