augur curate format-dates: accept masked dates #2483

Job	Run time
test (python=3.8 biopython=1.80)	9m 43s
pathogen-repo-ci (avian-flu)	42s
test (python=3.8 biopython=latest)	9m 37s
pathogen-repo-ci (ebola)	54s
test (python=3.9 biopython=1.80)	10m 9s
pathogen-repo-ci (lassa)	46s
test (python=3.9 biopython=latest)	10m 8s
pathogen-repo-ci (mumps)	58s
test (python=3.10 biopython=1.80)	10m 8s
pathogen-repo-ci (ncov)	1m 1s
test (python=3.10 biopython=latest)	10m 28s
pathogen-repo-ci (rsv)	2m 23s
test (python=3.11 biopython=1.80)	10m 3s
pathogen-repo-ci (seasonal-flu)	35s
test (python=3.11 biopython=latest)	10m 52s
pathogen-repo-ci (tb)	1m 19s
build-docs / build-conda	0s
build-docs / build-pip	52s
codecov	12s
	1h 30m 50s

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