RFR: 8291027: Some of TimeZone methods marked 'synchronized' unnecessarily

[Andrey Turbanov]

8291027: Some of TimeZone methods marked 'synchronized' unnecessarily

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Commit messages:
 - 8291027: Some of TimeZone methods marked 'synchronized' unnecessarily

Changes: https://git.openjdk.org/jdk/pull/17441/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17441&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8291027
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/17441.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17441/head:pull/17441

PR: https://git.openjdk.org/jdk/pull/17441