Fix CHANGES upgrade protoc comment to 3.17.3 (#8203)
Fix CHANGES upgrade protoc comment to 3.17.3 (#8203)

Signed-off-by: Marc Navarro Sonnenfeld <8d7927cb095bfd2a09b9fdf157de773e27c9400e@tetrate.io>
apache/skywalking,apache/skywalking,apache/skywalking,apache/skywalking,apache/skywalking,apache/skywalking,apache/skywalking