Update dependency nghttp2/nghttp2 to v1.55.0

This MR contains the following updates:

Package	Type	Update	Change
nghttp2/nghttp2	ironbank-github	minor	v1.54.0 -> v1.55.0

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Release Notes

nghttp2/nghttp2

v1.55.0: nghttp2 v1.55.0

Compare Source

What's Changed

• Fix build error without libev by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1915
• Bump go to 1.20 by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1916
• Bump go package dependencies by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1917
• mruby: Support cross build for autotools by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1918
• h2load, nghttpx: Add UDP_GRO support by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1920
• Bump ngtcp2 by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1923
• nghttpx: Randomize initial QUIC packet number by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1925
• Bump llhttp to a0e744f by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1926
• Bump macos to 12 by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1927

Full Changelog: https://github.com/nghttp2/nghttp2/compare/v1.54.0...v1.55.0

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