NFC: Fix year in copyright assertion comment #449

Job	Run time
linux/3.8/bare-env	8s
lint/style-and-typos	43s
linux/3.12	18m 42s
osx/3.10	16m 38s
win/3.9	47m 17s
linux/3.11/conda	19m 49s
linux/3.9/mpi	10m 6s
linux/3.11/singletest	34m 31s
linux/3.10/cython	20m 48s
win/3.8/pip	29m 18s
process-coverage-${{ matrix.TARGET }}	0s
	3h 18m 0s

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