fix(deps): update dependency undici to ^6.15.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
undici (source)	^6.14.1 -> ^6.15.0

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Release Notes

nodejs/undici (undici)

v6.15.0

Compare Source

What's Changed

• Expose EnvHttpProxyAgent to Node.js core bundle, so it can be turned … by @​mcollina in https://github.com/nodejs/undici/pull/3148
• test: add headerslist copy check by @​tsctx in https://github.com/nodejs/undici/pull/3156
• chore: ensure automated v6 release compared to v6 by @​mweberxyz in https://github.com/nodejs/undici/pull/3149
• fetch: do not leak signal listeners by @​mcollina in https://github.com/nodejs/undici/pull/3158
• fix: request cache mode is not the same as request mode by @​tsibley in https://github.com/nodejs/undici/pull/3151
• fetch: don't re-lowercase HeadersList by @​tsctx in https://github.com/nodejs/undici/pull/3159
• fix casing issue when cloning Headers object by @​KhafraDev in https://github.com/nodejs/undici/pull/3160
• build(deps): bump node from 6d0f18a to db8772d in /build by @​dependabot in https://github.com/nodejs/undici/pull/3163
• fix header cloning bug by @​tsctx in https://github.com/nodejs/undici/pull/3162
• chore: change bench naming for h2 by @​metcoder95 in https://github.com/nodejs/undici/pull/3165
• expose WebSocket related events in node bundle by @​KhafraDev in https://github.com/nodejs/undici/pull/3167
• feat: add support for if-match on retry handler by @​metcoder95 in https://github.com/nodejs/undici/pull/3144
• fix: correct firing order of abort events by @​tsctx in https://github.com/nodejs/undici/pull/3169
• create fast MessageEvent by @​KhafraDev in https://github.com/nodejs/undici/pull/3170
• chore: add explicitly @​fastify/busboy by @​Uzlopak in https://github.com/nodejs/undici/pull/3172
• chore: remove sinon as dev dependency by @​Uzlopak in https://github.com/nodejs/undici/pull/3171
• webidl changes by @​KhafraDev in https://github.com/nodejs/undici/pull/3175
• preserve dictionary key name in webidl errors by @​KhafraDev in https://github.com/nodejs/undici/pull/3176

New Contributors

• @​tsibley made their first contribution in https://github.com/nodejs/undici/pull/3151

Full Changelog: nodejs/undici@v6.14.1...v6.15.0

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