[tz] Wrong timezone

[Minu Shie]

Hi, I've checked the sites that are currently using your database and all
of them have the wrong timezone for Valle Hermoso, Tamaulipas, México.
Which should be the same as Matamoros, Tamaulipas, México.
(America/Matamoros) instead of (America/Monterrey).

Source from the Government official diary in Article 5, paragraph I:

https://dof.gob.mx/nota_detalle.php?codigo=5670045&fecha=28/10/2022#gsc.tab=0
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