test: add ref comment to test-regress-nodejsGH-814

Because the GitHub issue referred to by the test name is in an old
repository, put a link to it in a comment in
test/pummel/test-regress-GH-814.js.

PR-URL: nodejs#34516
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

test/pummel/test-regress-GH-814.js

@@ -19,6 +19,8 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+// Refs: https://github.com/nodejs/node-v0.x-archive/issues/814
+
 'use strict';
 // Flags: --expose_gc