constified more pointers in containers (#8615) #19998

Job	Run time
build_cmake (ubuntu:25.10, true, true)	4m 17s
build_make (ubuntu:25.10)	4m 27s
build_make (ubuntu:24.04)	3m 50s
build_cmake (ubuntu:24.04, true, true)	4m 28s
build_cmake (alpine:3.23, false, false)	4m 7s
build_make (alpine:3.23)	5m 52s
	27m 1s

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