fix: make tzlc content check case insensitive

Update compile_tzlc.py to perform case insensitive comparison when
checking if timezone/locale compatibility test outputs match expected
content. This makes the compatibility tests more robust by handling
variations in capitalization that may occur across different systems.

Before: content not in expected_content (case sensitive)
After: content.lower() not in [c.lower() for c in expected_content] (case insensitive)

This prevents false negatives when version strings have different
capitalization (e.g., "Version:1.32.0" vs "version:1.32.0").

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: AndreyNikiforov

scripts/compile_tzlc.py

@@ -11,7 +11,10 @@ def special_content_checker(expected_content):
     def _intern(filepath):
         with open(filepath, encoding="UTF-8") as file:
             content = file.read().strip()
-            return content not in expected_content
+            # Case insensitive comparison
+            content_lower = content.lower()
+            expected_content_lower = [c.lower() for c in expected_content]
+            return content_lower not in expected_content_lower
 
     return _intern