Fix bug in date deserialization of device method response

[brycewang-microsoft]

For #3093,

Newtonsoft.Json has a known issue where date serialization/deserialization drops trailing zeros in the microseconds date portion by default. As a result, a method payload containing date type will be deserialized into an improperly formatted ISO 8601 string and cannot be parsed correctly.

{"MyIso8601Date":"2023-01-31T01:37:08.45994-08:00"}

Unhandled exception. System.FormatException: String '2023-01-31T01:37:08.45994-08:00' was not recognized as a valid DateTime.
   at System.DateTimeParse.ParseExact(ReadOnlySpan`1 s, ReadOnlySpan`1 format, DateTimeFormatInfo dtfi, DateTimeStyles style, TimeSpan& offset)
   at System.DateTimeOffset.ParseExact(String input, String format, IFormatProvider formatProvider, DateTimeStyles styles)

[brycewang-microsoft]

/azp run

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[brycewang-microsoft]

/azp run

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[brycewang-microsoft]

/azp run

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