[jdk21u-dev] RFR: 8183348: Better cleanup for jdk/test/sun/security/pkcs12/P12SecretKey.java

[Goetz Lindenmaier]

I backport this test change as it also goes to 21.0.9-oracle

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Commit messages:
 - Backport 03f0ec4a35855b59c8faaf4be2e7569a12b4d5db

Changes: https://git.openjdk.org/jdk21u-dev/pull/1820/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1820&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8183348
  Stats: 33 lines in 1 file changed: 9 ins; 6 del; 18 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1820.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1820/head:pull/1820

PR: https://git.openjdk.org/jdk21u-dev/pull/1820