workaround byte-buddy caching issue

Author: trask

instrumentation/armeria/armeria-1.3/library/src/main/java/io/opentelemetry/instrumentation/armeria/v1_3/internal/RequestContextGetter.java

@@ -37,11 +37,11 @@ public Iterator<String> getAll(@Nullable ServiceRequestContext carrier, String k
     return carrier.request().headers().valueIterator(key);
   }
 
-  private static final class HeaderNamesIterator implements Iterator<String> {
+  static final class HeaderNamesIterator implements Iterator<String> {
 
     private final Iterator<AsciiString> delegate;
 
-    private HeaderNamesIterator(Iterator<AsciiString> delegate) {
+    HeaderNamesIterator(Iterator<AsciiString> delegate) {
       this.delegate = delegate;
     }