[jdk21u-dev] RFR: 8340899: Remove wildcard bound in PositionWindows.positionTestWindows

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

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Commit messages:
 - Backport e2626db2f00d0cc9f3ff8ea374a1ccc89373e398

Changes: https://git.openjdk.org/jdk21u-dev/pull/1086/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1086&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340899
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1086.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1086/head:pull/1086

PR: https://git.openjdk.org/jdk21u-dev/pull/1086