Bump scipp from 25.12.0 to 26.1.0 in /requirements #854

Job	Run time
Formatting and static analysis	13s
Tests (ubuntu-24.04, 3.11, py311) / test	1m 44s
Tests (ubuntu-24.04, 3.11, py311) / package-test	26s
docs / Build documentation	3m 3s
	5m 26s

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