Update dependency nuxt to v2.15.5

This MR contains the following updates:

Package	Type	Update	Change
nuxt	dependencies	patch	2.15.4 -> 2.15.5

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Release Notes

nuxt/nuxt.js

v2.15.5

Compare Source

🐛 Bug Fixes

• babel
  • #​9232 Loose option for babel class-properties and private-methods (resolves #​9224)
• vue-app
  • #​9201 Use route.replace instead of router.push to trigger navigation guards (resolves #​9111)
• builder
  • #​9153 Resolve aliases in build.watch paths (resolves #​9045)
• cli
  • #​9152 Add warning for css-loader < 4.2 (resolves #​9117)

💖 Thanks to

• Thomas Beduneau (@​enwin)
• @​rlam3

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