Update copyright year to 2026 #1977

Job	Run time
pytest (ubuntu-latest, 3.14)	11m 23s
pytest (ubuntu-latest, 3.14t)	12m 5s
pytest (ubuntu-latest, 3.9)	12m 6s
check_coverage	24s
add_coverage_to_pullrequest	18s
Publish Tests Results	18s
upload_coverage_to_coveralls	-1s
	36m 33s

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