Hono 4.12.31 release notes

test(context): assert case-insensitive header names in response helpers by @yusukebe in https://github.com/honojs/hono/pull/5116
chore(benchmark): add app.fetch() overhead benchmark by @yusukebe in https://github.com/honojs/hono/pull/5117
refactor(aws-lambada): remove FIXME in @ts-expect-error by @yusukebe in https://github.com/honojs/hono/pull/5130
fix(utils/body): reuse cached formData in parseBody() by @yusukebe in https://github.com/honojs/hono/pull/5131
fix(request): fix multipart boundary mismatch in cloneRawRequest by @yusukebe in https://github.com/honojs/hono/pull/5133
fix(sse): emit retry feild when retry is 0 by @yusukebe in https://github.com/honojs/hono/pull/5135
test(validator): fix misspelled identifier in transform type test by @yusukebe in https://github.com/honojs/hono/pull/5136

Full Changelog: https://github.com/honojs/hono/compare/v4.12.30...v4.12.31