[jdk21u-dev] RFR: 8368982: Test sun/security/tools/jarsigner/EC.java completed and timed out

[SendaoYan]

Hi all,

This pull request contains a backport of commit [b0721e28](https://github.com/openjdk/jdk/commit/b0721e28591f2ee19fd5cb6581747df0b1efed48) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Mikhail Yankelevich on 23 Oct 2025 and was reviewed by Rajan Halade.

Change has been verified locally on linux-x64. Test-fix only, no risk.

Thanks!

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Commit messages:
 - Backport b0721e28591f2ee19fd5cb6581747df0b1efed48

Changes: https://git.openjdk.org/jdk21u-dev/pull/2387/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2387&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368982
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2387.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2387/head:pull/2387

PR: https://git.openjdk.org/jdk21u-dev/pull/2387