nghttp2: upgrade 1.53.0 -> 1.54.0

nghttp2: upgrade 1.53.0 -> 1.54.0

Changelog:
==========
  nghttpx: Consistent error handling and use of high-level API
  h2load: Fix http3 upload stall
  h2load: Use std::chrono::steady_clock for quic timestamp
  Avoid ev_now by @tatsuhiro-t in #1907
  Remove unused macro bswap64
  Bump ngtcp2 and nghttp3
  Bump libbpf to v1.2.0
  Avoid copies

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>