Java: add SHA-384 to list of secure crypto algorithms

[jcogs33]

Description

Adds SHA-384 as a secure algorithm so that the java/potentially-weak-cryptographic-algorithm query no longer flags it.

Adding SHA-384 aligns Java with other languages.

Pull Request checklist

All query authors

• A change note is added if necessary. See the documentation in this repository.
• QL tests are added if necessary. See Testing custom queries in the GitHub documentation.

Internal query authors only

• Changes are validated at scale (internal access required).

[jcogs33]

DCA alerts look good. Adding SHA-384 as a secure algorithm removes 46 FP alerts from the OWASP benchmark.