[jdk11u-dev] RFR: Merge jdk11u:master

[Goetz Lindenmaier]

Merge jdk11u 11.0.12+6 to jdk11u-dev

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

Commit messages:
 - Merge
 - Added tag jdk-11.0.12+6 for changeset 91e81ac08854
 - 8268678: LetsEncryptCA.java test fails as Let’s Encrypt Authority X3 is retired

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/81/files
  Stats: 126 lines in 2 files changed: 12 ins; 9 del; 105 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/81.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/81/head:pull/81

PR: https://git.openjdk.java.net/jdk11u-dev/pull/81