Bump supported iOS version to 12+

[thornbill]

Since we upgraded to Expo 43, we only support iOS 12+.

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov[bot]]

Codecov Report

Merging #399 (27db2e2) into master (519b3dd) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #399   +/-   ##
=======================================
  Coverage   60.79%   60.79%           
=======================================
  Files          46       46           
  Lines         931      931           
  Branches      187      187           
=======================================
  Hits          566      566           
  Misses        332      332           
  Partials       33       33           

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