chore: update vue to 2.5.21

[KaelWD]

Blocked by vuejs/vue#9131 and vuejs/vue#8498

Resolves #5633

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

[vercel]

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[codecov]

Codecov Report

Merging #5789 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #5789      +/-   ##
==========================================
+ Coverage   89.05%   89.06%   +<.01%     
==========================================
  Files         262      262              
  Lines        5923     5924       +1     
  Branches     1468     1468              
==========================================
+ Hits         5275     5276       +1     
  Misses        532      532              
  Partials      116      116

Impacted Files	Coverage Δ
...mponents/VExpansionPanel/VExpansionPanelContent.ts	84.84% <ø> (ø)	⬆️
packages/vuetify/src/components/VBadge/VBadge.ts	100% <ø> (ø)	⬆️
packages/vuetify/src/mixins/dependent.ts	100% <ø> (ø)	⬆️
packages/vuetify/src/mixins/bootable.ts	100% <ø> (ø)	⬆️
packages/vuetify/src/components/VChip/VChip.ts	100% <ø> (ø)	⬆️
packages/vuetify/src/mixins/routable.ts	100% <ø> (ø)	⬆️
...ages/vuetify/src/components/VWindow/VWindowItem.ts	100% <ø> (ø)	⬆️
packages/vuetify/src/components/VAlert/VAlert.ts	100% <ø> (ø)	⬆️
.../vuetify/src/components/VPagination/VPagination.ts	100% <ø> (ø)	⬆️
...ages/vuetify/src/components/VTreeview/VTreeview.ts	99.35% <ø> (ø)	⬆️
... and 7 more

---

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[codecov]

Codecov Report

Merging #5789 into master will increase coverage by 0.08%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #5789      +/-   ##
==========================================
+ Coverage   89.17%   89.26%   +0.08%     
==========================================
  Files         262      262              
  Lines        5923     5971      +48     
  Branches     1467     1489      +22     
==========================================
+ Hits         5282     5330      +48     
+ Misses        528      524       -4     
- Partials      113      117       +4

Impacted Files	Coverage Δ
packages/vuetify/src/mixins/bootable.ts	100% <ø> (ø)	⬆️
...ages/vuetify/src/components/VWindow/VWindowItem.ts	100% <ø> (ø)	⬆️
packages/vuetify/src/components/VAlert/VAlert.ts	100% <ø> (ø)	⬆️
...ages/vuetify/src/components/VTreeview/VTreeview.ts	99.35% <ø> (ø)	⬆️
packages/vuetify/src/components/VWindow/VWindow.ts	100% <ø> (ø)	⬆️
.../vuetify/src/components/VPagination/VPagination.ts	100% <ø> (ø)	⬆️
packages/vuetify/src/mixins/routable.ts	100% <ø> (ø)	⬆️
packages/vuetify/src/mixins/dependent.ts	100% <ø> (ø)	⬆️
...ages/vuetify/src/components/VSnackbar/VSnackbar.ts	94.73% <100%> (-0.51%)	⬇️
packages/vuetify/src/components/VCard/index.ts	100% <100%> (ø)	⬆️
... and 16 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[lock]

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