[jdk17] RFR: 8270556: Exclude security/infra/java/security/cert/CertPathValidator/certification/LetsEncryptCA

[Christoph Langer]

The test is failing since 8th of July. Let's exclude it for now.

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Commit messages:
 - 8270556: Exclude security/infra/java/security/cert/CertPathValidator/certification/LetsEncryptCA

Changes: https://git.openjdk.java.net/jdk17/pull/251/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17&pr=251&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270556
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/251.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/251/head:pull/251

PR: https://git.openjdk.java.net/jdk17/pull/251