[jdk11u-dev] RFR: 8297257: Bump update version for OpenJDK: jdk-11.0.19

[Goetz Lindenmaier]

The necessary version bump. To be pushed after tag jdk-11.0.19+0.

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Commit messages:
 - 8297257: Bump update version for OpenJDK: jdk-11.0.19

Changes: https://git.openjdk.org/jdk11u-dev/pull/1536/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1536&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297257
  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1536.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1536/head:pull/1536

PR: https://git.openjdk.org/jdk11u-dev/pull/1536