Update dependency nghttp2/nghttp2 to v1.56.0

This MR contains the following updates:

Package	Type	Update	Change
nghttp2/nghttp2	ironbank-github	minor	v1.55.1 -> v1.56.0

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Release Notes

nghttp2/nghttp2

v1.56.0: nghttp2 v1.56.0

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What's Changed

• doc: Bump boringssl by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1928
• Fix memory leak by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1930
• Return void by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1931
• nghttpx: Rework sending and receiving ECN bits by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1934
• CMSG_DATA does not necessarily return an aligned pointer by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1935
• Bump quictls by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1937
• Bump ngtcp2 and its dependencies by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1939
• nghttpx: Simplify std::unique_ptr get and release by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1940
• Bump llhttp to 926c982 by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1941
• Bump libbpf to v1.2.2 by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1942
• Update Dockerfile by @​tatsuhiro-t in https://github.com/nghttp2/nghttp2/pull/1943

Full Changelog: https://github.com/nghttp2/nghttp2/compare/v1.55.0...v1.56.0

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