[jdk21u] RFR: 8327391: Add SipHash attribution file

[Goetz Lindenmaier]

I backport this for parity with 21.0.4-oracle.

I backport this to 21.0.3 as in 17 and 11 it also reaches the April update.

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Commit messages:
 - Backport fcf48ab3d36a7f8eed84e81c3e2445adcbc95374

Changes: https://git.openjdk.org/jdk21u/pull/442/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=442&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327391
  Stats: 150 lines in 1 file changed: 150 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u/pull/442.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/442/head:pull/442

PR: https://git.openjdk.org/jdk21u/pull/442