BUG: spatial.cKDTree: do not slide the median #14398

Job	Run time
Get commit message / Check for skips	5s
Oldest GCC & pydata/sparse, fast, py3.10/npMin, pip+pytest	19m 37s
Install into venv, cluster only, pyAny/npAny, pip+cluster.test()	17m 44s
32-bit, fast, py3.10/npMin, dev.py	28m 34s
Prerelease deps & coverage report, full, py3.10/npMin & py3.11/npPre, dev.py (3.10)	18m 26s
Python-debug & ATLAS & sdist+wheel, fast, py3.10/npMin, pip+pytest	25m 55s
Prerelease deps & coverage report, full, py3.10/npMin & py3.11/npPre, dev.py (3.11)	17m 15s
mypy (py3.10) & dev deps (py3.12), fast, dev.py (3.10, false)	17m 58s
mypy (py3.10) & dev deps (py3.12), fast, dev.py (3.12, false)	10m 39s
	2h 36m 13s

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