test: fix test-datetime-change-notify after daylight change

Add standard timezone name for Dublin without daylight saving

PR-URL: https://github.com/nodejs/node/pull/40684


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Voltrex <mohammadkeyvanzade94@gmail.com>