[jdk21] RFR: 8292704: sun/security/tools/jarsigner/compatibility/Compatibility.java use wrong key size for EC

[Rajan Halade]

This test update should be included in JDK 21 LTS release.

-------------

Commit messages:
 - Backport 130a9f138759c2f8504a83a6f3a93b1f219f0a42

Changes: https://git.openjdk.org/jdk21/pull/74/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=74&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292704
  Stats: 56 lines in 2 files changed: 43 ins; 1 del; 12 mod
  Patch: https://git.openjdk.org/jdk21/pull/74.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/74/head:pull/74

PR: https://git.openjdk.org/jdk21/pull/74