ARROW-15520: [C++] Qualify `arrow_vendored::date::format()` for C++20 compatibility#12317

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StephanTLavavej wants to merge 3 commits intoapache:masterfrom

StephanTLavavej:cxx20-format

Commits on Feb 1, 2022

C++20 compatibility: Qualify arrow_vendored::date::format().
StephanTLavavej
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Commits on Feb 2, 2022