BREAKING CHANGE: Update dependency postcss-flexbugs-fixes to v5

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-flexbugs-fixes	4.2.1 -> 5.0.2

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Release Notes

luisrudge/postcss-flexbugs-fixes (postcss-flexbugs-fixes)

v5.0.2

Compare Source

• Moving postcss to peer dependencies #​74

v5.0.1

Compare Source

• Adding postcss as dependency #​74

v5.0.0

Compare Source

• upgrade to postcss 8 #​71

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