[jdk20u] RFR: 8245654: Add Certigna Root CA

[Rajan Halade]

This is a backport to JDK 20 update releases.

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Commit messages:
 - Backport 8c87a67419b91f254ed7e4dd8ac8d294b8c4735e

Changes: https://git.openjdk.org/jdk20u/pull/4/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20u&pr=4&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8245654
  Stats: 262 lines in 3 files changed: 258 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk20u/pull/4.diff
  Fetch: git fetch https://git.openjdk.org/jdk20u pull/4/head:pull/4

PR: https://git.openjdk.org/jdk20u/pull/4