RFR: 8285253: update boot jdk to 18.0.1

[Ambarish Rapte]

Update Boot JDK to 18.0.1
Creating PR to initiate GitHub actions build.
Tested locally on Mac OS Catalina.

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Commit messages:
 - update boot jdk to 18.0.1

Changes: https://git.openjdk.org/jfx/pull/792/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=792&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285253
  Stats: 11 lines in 2 files changed: 0 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/jfx/pull/792.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/792/head:pull/792

PR: https://git.openjdk.org/jfx/pull/792