macOS

Upgrade libiconv to 1.19 for both Windows and Linux #888

Job	Run time
cache_libs / cache_libs (windows-2025-vs2026)	25s
cache_libs / cache_libs (windows-11-arm)	36s
cache_libs / cache_libs (ubuntu-22.04-arm)	18s
cache_libs / cache_libs (ubuntu-22.04)	18s
cache_libs / cache_libs (macos-latest)	12s
macosx (3.10, static)	6m 33s
macosx (3.9, static)	5m 57s
macosx (3.13, static)	3m 56s
macosx (3.14)	2m 52s
macosx (3.14, static)	5m 5s
macosx (3.12, static)	6m 18s
macosx (3.12)	2m 51s
macosx (3.11)	1m 37s
macosx (3.11, static)	4m 14s
macosx (3.9)	1m 44s
macosx (3.10)	2m 9s
macosx (3.13)	2m 28s
	47m 33s

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