Add "SHA-384" as a known attribute

[Ayman]

Hello,

Starting from JDK 19, SHA-384 is replacing SHA-256 as the default digest
algorithm in the jarsigner: https://bugs.openjdk.org/browse/JDK-8283475

This means that the string "SHA-384" is now written multiples times is the
MANIFEST files, this has been tackled in the past by adding the string
"SHA-256" as a KNOWN_NAME that shouldn't be duplicated in memory:
https://github.com/openjdk/jdk/blob/master/src/java.base/share/classes/java/util/jar/Attributes.java#L729

Is it possible to do the same with "SHA-384"?

Thanks,
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