[jdk21u] RFR: 8315644: increase timeout of sun/security/tools/jarsigner/Warning.java

[Matthias Baesken]

8315644: increase timeout of sun/security/tools/jarsigner/Warning.java

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Commit messages:
 - Backport 8bbebbba8fb870987295cb5f96147a9f9c5bfa6c

Changes: https://git.openjdk.org/jdk21u/pull/136/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=136&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315644
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u/pull/136.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/136/head:pull/136

PR: https://git.openjdk.org/jdk21u/pull/136