[jdk17] Integrated: 8268678: LetsEncryptCA.java test fails as Let’s Encrypt Authority X3 is retired

[Rajan Halade]

clean backport to JDK 17

Reviewed-by: xuelei

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Commit messages:
 - 8268678: LetsEncryptCA.java test fails as Let’s Encrypt Authority X3 is retired

Changes: https://git.openjdk.java.net/jdk17/pull/94/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17&pr=94&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268678
  Stats: 125 lines in 1 file changed: 11 ins; 9 del; 105 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/94.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/94/head:pull/94

PR: https://git.openjdk.java.net/jdk17/pull/94