Clean up misuses of `toLowerCase()`/`toUpperCase()` in java.base. -------------
Commit messages: - Update DateTimeFormatterBuilder - Avoid locale-sensitive case conversions in java.base Changes: https://git.openjdk.org/jdk/pull/14763/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14763&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8311943 Stats: 51 lines in 13 files changed: 9 ins; 0 del; 42 mod Patch: https://git.openjdk.org/jdk/pull/14763.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/14763/head:pull/14763 PR: https://git.openjdk.org/jdk/pull/14763
