[jdk11u-dev] RFR: 8318759: Add four DigiCert root certificates

[Andrew Lu]

I backport this for parity with 11.0.22-oracle.
location of the certs and the hash in the test changed, follow the jdk17 backport

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

Commit messages:
 - update
 - update
 - Merge branch 'master' into andrewLu_backport_8318759
 - Backport 0ea58048f9b4cdaaa0470b2bcc03913fb3939453

Changes: https://git.openjdk.org/jdk11u-dev/pull/2289/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2289&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318759
  Stats: 459 lines in 7 files changed: 456 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2289.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2289/head:pull/2289

PR: https://git.openjdk.org/jdk11u-dev/pull/2289