fix(country-map): Rename incorrect Vietnam province name for Country Map

[tienhung2812]

fix(country-map): Rename incorrect Vietnam province name for Country Map

SUMMARY

In country map chart, some Vietnamese province names in the country map chart are incorrect. I'd like to make the necessary corrections.

ISO 3166-2	Current name	Correct Name
VN-39	Đông Nam Bộ	Đồng Nai
VN-53	Đông Bắc	Bắc Kạn
VN-66	Đồng Bằng Sông Hồng	Hưng Yên

Source of corrected name: https://en.wikipedia.org/wiki/ISO_3166-2:VN

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

• Before:
• After:

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• [x] Has associated issue: https://github.com/apache/superset/issues/30607
• [ ] Required feature flags:
• [x] Changes UI
• [ ] Includes DB Migration (follow approval process in SIP-59)
  • [ ] Migration is atomic, supports rollback & is backwards-compatible
  • [ ] Confirm DB migration upgrade and downgrade tested
  • [ ] Runtime estimates and downtime expectations provided
• [ ] Introduces new feature or API
• [ ] Removes existing feature or API