Temporarily cap scikit-learn<=1.5.2 #31

Job	Run time
Build CI containers (xgb-ci.clang_tidy)	2m 23s
Build CI containers (xgb-ci.cpu)	12m 27s
Build CI containers (xgb-ci.gpu)	7m 48s
Build CI containers (xgb-ci.gpu_build_r_rockylinux8)	10m 41s
Build CI containers (xgb-ci.gpu_build_rockylinux8)	13m 36s
Build CI containers (xgb-ci.gpu_build_rockylinux8_dev_ver)	13m 40s
Build CI containers (xgb-ci.jvm)	2m 47s
Build CI containers (xgb-ci.jvm_gpu_build)	4m 58s
Build CI containers (xgb-ci.manylinux_2_28_x86_64)	35s
Build CI containers (xgb-ci.manylinux2014_x86_64)	1m 23s
Build CI containers (xgb-ci.i386)	57s
Build CI containers (xgb-ci.aarch64)	3m 57s
Build CI containers (xgb-ci.manylinux2014_aarch64)	1m 7s
	1h 16m 19s

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