Fix icu_capi features, bump to 1.2.1

[Manishearth]

No description provided.

[sffc]

Need to gn gen

[jira-pull-request-webhook]

Notice: the branch changed across the force-push!

• Cargo.lock is now changed in the branch
• CHANGELOG.md is now changed in the branch
• ffi/gn/Cargo.lock is now changed in the branch
• ffi/gn/icu4x/BUILD.gn is now changed in the branch

View Diff Across Force-Push

~ Your Friendly Jira-GitHub PR Checker Bot

[jira-pull-request-webhook]

Notice: the branch changed across the force-push!

• CHANGELOG.md is different

View Diff Across Force-Push

~ Your Friendly Jira-GitHub PR Checker Bot

[sffc]

cargo check-all-features really doesn't like this PR

[codecov-commenter]

Codecov Report

Merging #3344 (1d02b32) into main (6af64d2) will not change coverage.
The diff coverage is n/a.

❗ Current head 1d02b32 differs from pull request most recent head 2d96378. Consider uploading reports for the commit 2d96378 to get more accurate results

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@@           Coverage Diff           @@
##             main    #3344   +/-   ##
=======================================
  Coverage   74.99%   74.99%           
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  Files         689      689           
  Lines       43267    43267           
=======================================
  Hits        32446    32446           
  Misses      10821    10821           

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