[jdk17u-dev] RFR: 8294726: Update URLs in minefield tests

[Andrew Lu]

I backport this for parity with 17.0.14-oracle.

-------------

Commit messages:
 - Backport 090cdfc7a2e280c620a0926512fb67f0ce7f3c21

Changes: https://git.openjdk.org/jdk17u-dev/pull/2862/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2862&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294726
  Stats: 6 lines in 6 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2862.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2862/head:pull/2862

PR: https://git.openjdk.org/jdk17u-dev/pull/2862