encoding/jsonschema: recognize date-time too

The Kubernetes documentation is inconsistent about whether
the correct spelling is `datetime` or `date-time`. After digging into
the code a bit, it seems that both forms are accepted (and also
weird variants like `--date--time`, but we'll ignore that possibility).
See this comment for some background [1].

[1] kubernetes/kubernetes#131082 (comment)

Signed-off-by: Roger Peppe <[email protected]>
Change-Id: Idcc5175536b1df3044e27d68c3c400713e711c0d
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1214780
TryBot-Result: CUEcueckoo <[email protected]>
Reviewed-by: Daniel Martí <[email protected]>

Author: rogpeppe

encoding/jsonschema/constraints_format.go

@@ -39,7 +39,7 @@ var formatFuncs = sync.OnceValue(func() map[string]formatFuncInfo {
 		"creditcard":            {k8s, formatTODO},
 		"data":                  {openAPI, formatTODO},
 		"date":                  {vfrom(VersionDraft7) | openAPI | k8s, formatDate},
-		"date-time":             {allVersions | openAPI, formatDateTime},
+		"date-time":             {allVersions | openAPI | k8s, formatDateTime},
 		"datetime":              {k8s, formatDateTime},
 		"double":                {openAPI | k8s, formatTODO},
 		"duration":              {vfrom(VersionDraft2019_09) | k8s, formatTODO},