RFR: 8371722: java/net/httpclient/BufferSizePropertyClampTest.java should use Locale.ROOT

[Daniel Fuchs]

The test verifies that the expected message is logged by the jdk.httpclient.HttpClient logger. However it fails when run in e.g. Polish Locale because it expects 16,384 and finds 16 384 (with a non breaking space).

The proposed change makes sure we use Locale.ROOT to format the message.

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Commit messages:
 - 8371722: java/net/httpclient/BufferSizePropertyClampTest.java should use Locale.ROOT

Changes: https://git.openjdk.org/jdk/pull/28270/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28270&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8371722
  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/28270.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28270/head:pull/28270

PR: https://git.openjdk.org/jdk/pull/28270