[jdk23] RFR: 8333804: java/net/httpclient/ForbiddenHeadTest.java threw an exception with 0 failures

[Daniel Fuchs]

This is a trivial one liner bug fix in a test class to improve test stability. The backport is a clean backport.

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Commit messages:
 - Backport ec1664e8c9413890ce2dae5c2dbbce3449d67882

Changes: https://git.openjdk.org/jdk/pull/19751/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19751&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333804
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/19751.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19751/head:pull/19751

PR: https://git.openjdk.org/jdk/pull/19751