RawMailParser: Suppress JdkObsolete warning for usage of Date class
RawMailParser: Suppress JdkObsolete warning for usage of Date class

We cannot avoid using the Date class here since
org.apache.james.mime4j.dom.Message doesn't provide any other method to
get the timestamp of the message.

This change is a preparation for being able to enable the error level
for the JdkObsolete bug pattern in ErrorProne later.

Bug: Issue 15070
Signed-off-by: Edwin Kempin <d43fb6c98c97e553b671ed9a9318100f1de386e7@google.com>
Change-Id: I1665f7dd645c84c98642925a706a895a9f415b56

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