v15.5.14

[!NOTE] This release is backporting bug fixes. It does not include all pending features/changes on canary.

Core Changes

• feat(next/image): add lru disk cache and images.maximumDiskCacheSize (#91660)
• Fix(pages-router): restore Content-Length and ETag for /_next/data/ JSON responses (#90304)

Credits

Huge thanks to @styfle and @lllomh for helping!