[jdk21u-dev] RFR: 8322920: Some ProcessTools.execute* functions are declared to throw Throwable

[Goetz Lindenmaier]

I backport this for parity with 21.0.4-oracle.

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Commit messages:
 - Backport 868f8745faf70c915d8294ae8f85b2d6aa096900

Changes: https://git.openjdk.org/jdk21u-dev/pull/374/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=374&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322920
  Stats: 6 lines in 1 file changed: 0 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/374.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/374/head:pull/374

PR: https://git.openjdk.org/jdk21u-dev/pull/374