[jdk21u-dev] RFR: 8348600: Update PipeWire to 1.3.81

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle

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Commit messages:
 - Backport add3cd1ca470be8fd5e5e1930d7f789318eb8e6d

Changes: https://git.openjdk.org/jdk21u-dev/pull/1448/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1448&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348600
  Stats: 2369 lines in 72 files changed: 1728 ins; 59 del; 582 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1448.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1448/head:pull/1448

PR: https://git.openjdk.org/jdk21u-dev/pull/1448