Update dependency nuxt to v2.15.6

This MR contains the following updates:

Package	Type	Update	Change
nuxt	dependencies	patch	2.15.5 -> 2.15.6

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Release Notes

nuxt/nuxt.js

v2.15.6

Compare Source

🐛 Bug Fixes

• types
  • #​9270 Pin to @types/webpack-dev-middleware@4.1.2 (resolves #​9268)

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