fix: update provinces list of Nepal

[dipushrestha]

• Update the list of Provinces of Nepal with correct data.
• from Wikipedia

[what-the-diff]

PR Summary

• Updated Nepal's Provinces List
  The list of provinces for Nepal has undergone significant changes. Two new provinces, 'Koshi' and 'Madhesh', were added. An entirely new province named 'Sudurpashchim' was also introduced for the first time. However, several existing provinces, such as 'Bheri', 'Dhawalagiri', 'Janakpur', 'Kosi', 'Mahakali', 'Mechi', 'Narayani', 'Rapti', 'Sagarmatha', and 'Seti', were removed from the list. The modifications aim to keep the information up-to-date and accurate following the latest administrative structures in Nepal.

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[ageddesi]

@all-contributors add @dipushrestha for code

[allcontributors]

@ageddesi

I've put up a pull request to add @dipushrestha! 🎉