Update dependency Adafruit NeoPixel to v1.15.4

[renovate]

This PR contains the following updates:

Package	Update	Change
Adafruit NeoPixel	patch	1.15.2 → 1.15.4

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Release Notes

adafruit/Adafruit_NeoPixel (Adafruit NeoPixel)

v1.15.4: Add Support for XMC1400 2GO (KIT_XMC14_2GO)

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What's Changed

• Add Support for XMC1400 2GO (KIT_XMC14_2GO) by @​Brand-IFX in #​453

New Contributors

• @​Brand-IFX made their first contribution in #​453

Full Changelog: adafruit/Adafruit_NeoPixel@1.15.3...1.15.4

v1.15.3: Support timing for CH32V00x running >= 48MHz

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What's Changed

• Support timing for CH32V00x running at 48MHz by @​maxint-rd in #​454

New Contributors

• @​maxint-rd made their first contribution in #​454

Full Changelog: adafruit/Adafruit_NeoPixel@1.15.2...1.15.3

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