Fix #14987: Update simplecpp to 1.9.1 #20673

Job	Run time
build_cmake (alpine:3.23, false, false)	5m 1s
build_make (alpine:3.23)	3m 46s
build_cmake (ubuntu:25.10, true, true)	6m 12s
build_make (ubuntu:25.10)	5m 11s
build_cmake (ubuntu:24.04, true, true)	5m 57s
build_make (ubuntu:24.04)	4m 56s
	31m 3s

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