RFR: 8297887: Update Siphash

[Coleen Phillimore]

There was a small update to the copyright in the SipHash code that we're using, so reflecting that change in our sources.

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Commit messages:
 - 8297887: Update Siphash

Changes: https://git.openjdk.org/jdk/pull/14124/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14124&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297887
  Stats: 4 lines in 1 file changed: 0 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14124.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14124/head:pull/14124

PR: https://git.openjdk.org/jdk/pull/14124