Log Message:
nghttp2 nghttp2-tools: updated to 1.54.0

nghttp2 v1.54.0

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
Remove unused macro bswap64
Bump ngtcp2 and nghttp3
Bump libbpf to v1.2.0
Avoid copies