chore(release): release 12.1.0

[simplejason]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[zorro-bot]

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[codecov]

Codecov Report

Merging #7087 (7f9a7b7) into master (891a622) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 7f9a7b7 differs from pull request most recent head 557ecca. Consider uploading reports for the commit 557ecca to get more accurate results

@@           Coverage Diff           @@
##           master    #7087   +/-   ##
=======================================
  Coverage   89.59%   89.60%           
=======================================
  Files         488      488           
  Lines       15873    15873           
  Branches     2446     2446           
=======================================
+ Hits        14222    14223    +1     
+ Misses       1017     1016    -1     
  Partials      634      634           

Impacted Files	Coverage Δ
components/core/util/text-measure.ts	89.47% <0.00%> (-1.76%)	⬇️
components/tabs/tab-nav-bar.component.ts	85.10% <0.00%> (+0.70%)	⬆️
components/time-picker/time-holder.ts	96.84% <0.00%> (+1.05%)	⬆️

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[simplejason]

CI failed, it's caused by jest-worker@27.4.0, so I have to specify the version with ~27.3.1 to install it now to avoid this error.
jestjs/jest#12097

Updated: jest-worker 27.4.1 has been released.

[hsuanxyz]

LGTM