Define default pins for Cygnet/Swan Serial2/3#2826

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fpistm merged 3 commits intostm32duino:mainfrom

zfields:patch-2

Oct 7, 2025

Commits on Sep 26, 2025

Define default pins for Cygnet/Swan Serial2
zfields
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Commits on Oct 3, 2025

Apply suggestions from code review
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Commits on Oct 6, 2025

Update variants/STM32L4xx/L4R5Z(G-I)Y_L4R9Z(G-I)Y_L4S5ZIY_L4S9ZIY/variant_SWAN_R5.h

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