RFR: 8273366: [testbug] javax/swing/UIDefaults/6302464/bug6302464.java fails on macOS12

[Prasanta Sadhukhan]

Test fails on macOS12 since the check was only upto macOS11..Extended the check for BigSurOrAbove.

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Commit messages:
 - Check BigSurOrAbove

Changes: https://git.openjdk.java.net/jdk/pull/5434/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5434&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273366
  Stats: 10 lines in 1 file changed: 6 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5434.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5434/head:pull/5434

PR: https://git.openjdk.java.net/jdk/pull/5434