Update dependency dayjs to v1.11.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
dayjs (source)	1.11.18 → 1.11.21

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Release Notes

iamkun/dayjs (dayjs)

v1.11.21

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Bug Fixes

• preserve unsupported year tokens in format (#​3015) (#​3016) (8fda602)

v1.11.20

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Bug Fixes

• Update locale km.js to support meridiem (#​3017) (9d2b6a1)
• update updateLocale plugin to merge nested object properties instead of replacing (#​3012) (99691c5), closes #​1118

v1.11.19

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Bug Fixes

• added usage warnings for diff + updated unit tests (#​2948) (269a7a9)
• dont instantiate regexes within ar locale functions to avoid performance overhead (#​2898) (af5e9f0)
• replace italian locale "un' ora fa" with "un'ora fa", add tests for it (#​2930) (9e9f76c)
• Updated Belarusian locale with relative time (#​2656) (1d8746c)

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