fix: spectrum smoothing and autocorrelations #933

Job	Run time
s1_s2_mpi (3.10, linear, rma)	2m 54s
s1_s2 (3.9, linear, rma, asdf, false)	2m 16s
unit_tests	6m 1s
unit_tests_win	7m 24s
s1_s2 (3.9, robust, rma, asdf, false)	2m 7s
s1_s2 (3.9, nroot, rma, asdf, false)	2m 5s
s1_s2 (3.9, selective, rma, asdf, false)	2m 16s
s3_dates (3.9)	2m 7s
s1_s2 (3.9, auto_covariance, rma, asdf, false)	2m 6s
s3_dates (3.10)	1m 52s
s1_s2 (3.9, pws, rma, asdf, false)	2m 4s
s1_s2 (3.10, linear, rma, asdf, false)	2m 1s
s1_s2 (3.10, robust, rma, asdf, false)	2m 12s
s1_s2 (3.10, nroot, rma, asdf, false)	2m 2s
s1_s2 (3.10, selective, rma, asdf, false)	2m 0s
s1_s2 (3.10, auto_covariance, rma, asdf, false)	2m 18s
s1_s2 (3.10, pws, rma, asdf, false)	1m 53s
s1_s2 (linear, 3.10, no, zarr, true)	2m 3s
s1_s2 (all, 3.9, phase_only, numpy)	2m 17s
	49m 58s

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