RFR: 8309934: Update GitHub Actions to use JDK 17 for building jtreg

Wed Jun 14 10:15:31 UTC 2023

Hi all,

This pull request contains a backport of commit [8aad881e](https://github.com/openjdk/jdk/commit/8aad881e803fddc26f45270f779ff0c0e5a095d8) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Christian Stein on 13 Jun 2023 and was reviewed by Erik Joelsson.

Thanks!

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Commit messages:
 - Backport 8aad881e803fddc26f45270f779ff0c0e5a095d8

Changes: https://git.openjdk.org/jdk21/pull/18/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=18&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309934
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21/pull/18.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/18/head:pull/18

PR: https://git.openjdk.org/jdk21/pull/18