[jdk11u-dev] RFR: 8245654: Add Certigna Root CA

[Goetz Lindenmaier]

I backport this for parity with 11.0.19-oracle from 17.

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Commit messages:
 - Backport c8ee076241cc7d83f423683d97ec37f9e0d6ebaa

Changes: https://git.openjdk.org/jdk11u-dev/pull/1775/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1775&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/jdk11u-dev/pull/1775.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1775/head:pull/1775

PR: https://git.openjdk.org/jdk11u-dev/pull/1775