Update dependency nuxt to v2.15.7

This MR contains the following updates:

Package	Type	Update	Change
nuxt	dependencies	patch	2.15.6 -> 2.15.7

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Release Notes

nuxt/nuxt.js

v2.15.7

Compare Source

🔰 Security advisory

Please upgrade to nuxt@^2.15.7 if using nuxt@2.15.5 or nuxt@2.15.6

🐛 Bug Fixes

• vue-app
  • #​9431 Check whether a route exists within the nuxt app before replacing

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