[jdk8u-dev] RFR: 8326686: Bump update version of OpenJDK: 8u422

[Andrew John Hughes]

Rampdown for 8u412 [has begun](https://mail.openjdk.org/pipermail/jdk8u-dev/2024-February/018091.html). 8u-dev needs to transition to 8u422.

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Commit messages:
 - 8326686: Bump update version of OpenJDK: 8u422

Changes: https://git.openjdk.org/jdk8u-dev/pull/456/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=456&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326686
  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/456.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/456/head:pull/456

PR: https://git.openjdk.org/jdk8u-dev/pull/456