3/2 Respect default Locale when lowercasing header strings

Author: 43jay

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

@@ -2,6 +2,7 @@
 
 import java.util.HashSet;
 import java.util.LinkedHashMap;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
 import org.jetbrains.annotations.NotNull;