curator/api: Capitalise ISO code in downloadAsync

[abhidg]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2433 (5684a3a) into main (a96dc69) will decrease coverage by 22.63%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##             main    #2433       +/-   ##
===========================================
- Coverage   88.89%   66.26%   -22.64%     
===========================================
  Files          34       25        -9     
  Lines        1171     1156       -15     
  Branches      273      204       -69     
===========================================
- Hits         1041      766      -275     
- Misses        130      390      +260     

Impacted Files	Coverage Δ
...ation/curator-service/api/src/controllers/cases.ts	44.94% <0.00%> (ø)
data-serving/data-service/src/model/vaccine.ts
data-serving/data-service/src/model/event.ts
...a-serving/data-service/src/model/case-reference.ts
...ata-serving/data-service/src/model/demographics.ts
data-serving/data-service/src/util/logger.ts
data-serving/data-service/src/model/date.ts
data-serving/data-service/src/model/source.ts
...a-serving/data-service/src/model/travel-history.ts
data-serving/data-service/src/model/travel.ts
... and 50 more

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