doc: Add CITATION.cff file and update vCHEP DOI #1954

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Job	Run time
pre-commit	17s
test (3.8)	3m 42s
test (3.9)	3m 30s
test (3.10)	3m 28s
test (3.11)	3m 29s
test (3.12)	3m 44s
	18m 10s