`InstantDeserializer` is not respecting leniency w.r.t. to numeric values

We annotated some constructor properties with @JsonFormat(lenient = OptBoolean.FALSE) but found that the InstantDeserializer is not applying it when deserializing numeric values.

Expected _failForNotLenient(parser, context, JsonToken.VALUE_STRING) to be invoked for the numeric cases in InstantDeserialize#deserialize when _not_ lenient.

(It looks like LocalDateDeserializer implementation is applying leniency in the case of an integer value as expected; InstantDeserializer should implement similarly.)