fix: Add mexico back to country map

[etr2460]

SUMMARY

#18081 accidentally removed mexico from the map (probably a bad merge resolution). Adding it back

TESTING INSTRUCTIONS

CI

to: @ktmud @zhaoyongjie

[codecov]

Codecov Report

Merging #18219 (da475b7) into master (2dfcbdb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #18219   +/-   ##
=======================================
  Coverage   66.05%   66.05%           
=======================================
  Files        1591     1591           
  Lines       62423    62423           
  Branches     6287     6287           
=======================================
  Hits        41233    41233           
  Misses      19568    19568           
  Partials     1622     1622           

Flag	Coverage Δ
hive	52.17% <ø> (ø)
javascript	50.86% <ø> (ø)
mysql	81.28% <ø> (ø)
postgres	81.33% <ø> (ø)
presto	52.01% <ø> (ø)
python	81.77% <ø> (ø)
sqlite	81.03% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...s/legacy-plugin-chart-country-map/src/countries.ts	100.00% <ø> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2dfcbdb...da475b7. Read the comment docs.