[IGNORE] chore: Patch build for 0.21.0

[miroslavstastny]

DO NOT MERGE

Removed:

• fix(ListItem): fixed selectors for item layout in the list item styles (Teams theme) #882
• chore(package): add polyfills to correctly work in IE11 #868

Added:

• fix(FocusTrapZone): Do not hide aria-live regions from accessibility tree #917

[DustyTheBot]

	Warnings
⚠️	There are no updates provided to CHANGELOG. Ensure there are no publicly visible changes introduced by this PR.

Generated by 🚫 dangerJS

[codecov]

Codecov Report

Merging #935 into master will increase coverage by 12.57%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #935       +/-   ##
===========================================
+ Coverage   80.42%   92.99%   +12.57%     
===========================================
  Files         659       21      -638     
  Lines        8412      728     -7684     
  Branches     1488       73     -1415     
===========================================
- Hits         6765      677     -6088     
+ Misses       1632       51     -1581     
+ Partials       15        0       -15

Impacted Files	Coverage Δ
...s/Icon/svg/ProcessedIcons/icons-files-document.tsx
...omponents/Icon/svg/ProcessedIcons/icons-waffle.tsx
...s/components/RadioGroup/radioGroupItemVariables.ts
.../themes/teams/components/Icon/svg/icons/italic.tsx
...accessibility/Behaviors/Toolbar/toolbarBehavior.ts
.../Icon/svg/ProcessedIcons/icons-play-sound-mute.tsx
...ckages/react/src/components/Button/ButtonGroup.tsx
...src/themes/teams/components/Flex/flexItemStyles.ts
packages/react/src/components/Flex/Flex.tsx
...components/Icon/svg/ProcessedIcons/icons-retry.tsx
... and 631 more

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