feat: bump polars to 0.38.2 #551

Job	Run time
build (ubuntu-20.04, x86_64-unknown-linux-gnu)	11m 18s
build (ubuntu-20.04, aarch64-unknown-linux-gnu)	11m 58s
build (macos-14, x86_64-apple-darwin)	14m 59s
build (macos-14, aarch64-apple-darwin)	16m 47s
build (windows-latest, x86_64-pc-windows-gnu)	26m 6s
test (macos-12, release)	4m 38s
test (macos-14, release)	2m 3s
test (windows-latest, oldrel-1)	6m 41s
test (windows-latest, release)	5m 24s
test (windows-latest, devel)	4m 48s
test (ubuntu-latest, oldrel-1)	2m 31s
test (ubuntu-latest, release)	2m 12s
test (ubuntu-latest, devel)	6m 11s
merge	9s
release	0s
	1h 55m 45s

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