Update dependency nghttp2/nghttp2 to v1.55.1

This MR contains the following updates:

Package	Type	Update	Change
nghttp2/nghttp2	ironbank-github	patch	v1.55.0 -> v1.55.1

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Release Notes

nghttp2/nghttp2

v1.55.1: nghttp2 v1.55.1

Compare Source

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

Full Changelog: https://github.com/nghttp2/nghttp2/compare/v1.55.0...v1.55.1

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