chore(deps): update mccutchen/go-httpbin docker tag to v2.12.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
mccutchen/go-httpbin	minor	v2.11.0 -> v2.12.0
mccutchen/go-httpbin	minor	v2.9.0 -> v2.12.0

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Release Notes

mccutchen/go-httpbin (mccutchen/go-httpbin)

### [`v2.12.0`](https://togithub.com/mccutchen/go-httpbin/releases/tag/v2.12.0) [Compare Source](https://togithub.com/mccutchen/go-httpbin/compare/v2.11.1...v2.12.0) ##### What's Changed - fix: /base64 endpoint decodes both URL-safe and standard b64 encodings by [@​mccutchen](https://togithub.com/mccutchen) in [https://github.com/mccutchen/go-httpbin/pull/153](https://togithub.com/mccutchen/go-httpbin/pull/153) **Full Changelog**: https://github.com/mccutchen/go-httpbin/compare/v2.11.1...v2.12.0 ### [`v2.11.1`](https://togithub.com/mccutchen/go-httpbin/releases/tag/v2.11.1) [Compare Source](https://togithub.com/mccutchen/go-httpbin/compare/v2.11.0...v2.11.1) #### What's Changed - chore: upgrade to Go 1.21 by [@​harryzcy](https://togithub.com/harryzcy) in [https://github.com/mccutchen/go-httpbin/pull/143](https://togithub.com/mccutchen/go-httpbin/pull/143) - feat: special case CloudFlare client IP addrs by [@​vanodevium](https://togithub.com/vanodevium) in [https://github.com/mccutchen/go-httpbin/pull/148](https://togithub.com/mccutchen/go-httpbin/pull/148) #### New Contributors - [@​harryzcy](https://togithub.com/harryzcy) made their first contribution in [https://github.com/mccutchen/go-httpbin/pull/143](https://togithub.com/mccutchen/go-httpbin/pull/143) - [@​vanodevium](https://togithub.com/vanodevium) made their first contribution in [https://github.com/mccutchen/go-httpbin/pull/148](https://togithub.com/mccutchen/go-httpbin/pull/148) **Full Changelog**: https://github.com/mccutchen/go-httpbin/compare/v2.11.0...v2.11.1

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