[jdk17u-dev] RFR: 8366233: Bump update version for OpenJDK: jdk-17.0.18

[Goetz Lindenmaier]

The required version bump.

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Commit messages:
 - 8366233: Bump update version for OpenJDK: jdk-17.0.18

Changes: https://git.openjdk.org/jdk17u-dev/pull/3876/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3876&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366233
  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3876.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3876/head:pull/3876

PR: https://git.openjdk.org/jdk17u-dev/pull/3876