[jdk21u] RFR: 8341057: Add 2 SSL.com TLS roots

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

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Commit messages:
 - Backport 824a297aae15ba16cf6d7aded4b95fc9d6bf55e5

Changes: https://git.openjdk.org/jdk21u/pull/455/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=455&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341057
  Stats: 98 lines in 4 files changed: 93 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u/pull/455.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/455/head:pull/455

PR: https://git.openjdk.org/jdk21u/pull/455