Add one-off public holiday in Latvia to honor ice hockey team bronze medal win in 2023 IIHF World Championship

[aleksandrs-ledovskis]

Per subject. Tests pass.

• Ref: https://www.vestnesis.lv/op/2023/102A.1
• Ref: https://likumi.lv/ta/id/72608-par-svetku-atceres-un-atzimejamam-dienam
• Ref: https://saeima.lv/lv/aktualitates/saeimas-zinas/32316-29-maijs-bus-svetku-diena-lemj-saeima