RFR: 8343481: Remove unnecessary @SuppressWarnings annotations (kulla)

[Archie Cobbs]

Please review this patch which removes unnecessary `@SuppressWarnings` annotations.

-------------

Commit messages:
 - Remove unnecessary @SuppressWarnings annotations.

Changes: https://git.openjdk.org/jdk/pull/21855/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21855&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343481
  Stats: 16 lines in 15 files changed: 0 ins; 16 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21855.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21855/head:pull/21855

PR: https://git.openjdk.org/jdk/pull/21855