2/2 Respect default Locale when lowercasing header strings

Co-authored-by: Markus Hintersteiner <markus.hintersteiner@sentry.io>

Author: 43jay

sentry/src/main/java/io/sentry/util/network/NetworkDetailCaptureUtils.java

@@ -131,7 +131,7 @@ private static boolean shouldCaptureUrl(
     Set<String> normalizedAllowed = new HashSet<>();
     for (String header : allowedHeaders) {
       if (header != null) {
-        normalizedAllowed.add(header.toLowerCase());
+        normalizedAllowed.add(header.toLowerCase(Locale.ROOT));
       }
     }