Use String.toLowerCase()/toUpperCase() with Locale.ROOT consistently #5711
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This PR changes to use
String.toLowerCase()andString.toUpperCase()with theLocale.ROOTconsistently as it seems to be a good practice aside from security.This PR also adds Checkstyle rules for it.
See spring-projects/spring-framework#33708 and https://errorprone.info/bugpattern/StringCaseLocaleUsage