v12.1.5-canary.6

Core Changes

• update @vercel/nft to 0.18.1: #36075
• Fix outputStandalone with optimizeCss: #36028

Misc Changes

• Update turbo cache key: #36074
• docs: suggest cloning with depth=1 to avoid huge downloads: #36064

Credits

Huge thanks to @gsimone and @Ethan-Arrowood for helping!