[jdk20u] RFR: JDK-8303906: Update jdk20u fix version to 20.0.2

[Rob McKenna]

Update the jdk20u jcheck fix version

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Commit messages:
 - JDK-8303906: Update jdk20u fix version to 20.0.2

Changes: https://git.openjdk.org/jdk20u/pull/17/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20u&pr=17&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303906
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk20u/pull/17.diff
  Fetch: git fetch https://git.openjdk.org/jdk20u pull/17/head:pull/17

PR: https://git.openjdk.org/jdk20u/pull/17