Fix locale-sensitive toLowerCase() in wildcard path dedup

[Copilot]

childPath.toLowerCase() uses the default JVM locale, causing incorrect case folding in locales like Turkish (where I → ı), leading to incorrect deduplication of wildcard child paths.

Changes

• JFlat.java: Replace childPath.toLowerCase() with childPath.toLowerCase(Locale.ROOT) for locale-independent case folding
• Add import java.util.Locale

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• checkstyle.org
  • Triggering command: /opt/hostedtoolcache/CodeQL/2.24.3/x64/codeql/tools/linux64/java/bin/java /opt/hostedtoolcache/CodeQL/2.24.3/x64/codeql/tools/linux64/java/bin/java -jar /opt/hostedtoolcache/CodeQL/2.24.3/x64/codeql/xml/tools/xml-extractor.jar --fileList=/tmp/codeql-scratch-3f672d5de33c41b7/dbs/java/working/files-to-index15355685787754852219.list --sourceArchiveDir=/tmp/codeql-scratch-3f672d5de33c41b7/dbs/java/src --outputDir=/tmp/codeql-scratch-3f672d5de33c41b7/dbs/java/trap/java (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)