Update dependency @vue/devtools to v6.1.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@vue/devtools	6.1.3 -> 6.1.4

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Release Notes

vuejs/vue-devtools

### [`v6.1.4`](https://togithub.com/vuejs/vue-devtools/releases/v6.1.4) [Compare Source](https://togithub.com/vuejs/vue-devtools/compare/v6.1.3...v6.1.4) ##### Bug Fixes - **components:** check subTree null, related to [#​1760](https://togithub.com/vuejs/vue-devtools/issues/1760) ([9606ae3](https://togithub.com/vuejs/vue-devtools/commit/9606ae358ff1b032e95bb45e7a0dee8f85d9907e)) - **electron:** enable CORS for socket.io server (fix [#​1813](https://togithub.com/vuejs/vue-devtools/issues/1813)) ([#​1815](https://togithub.com/vuejs/vue-devtools/issues/1815)) ([dc9d010](https://togithub.com/vuejs/vue-devtools/commit/dc9d0107f8a29b2a13239a310a45e84424c3d693)) - layer select overflowing ([#​1790](https://togithub.com/vuejs/vue-devtools/issues/1790)) ([e9398cd](https://togithub.com/vuejs/vue-devtools/commit/e9398cdef6c358aa0f5438e1644bcc69458fc38e)) - **timeline:** can't drag view to the bottom ([675952e](https://togithub.com/vuejs/vue-devtools/commit/675952e1d52234c35aba5f398c02eb00ed68b2e8)) - **timeline:** layer height changes glitching ([9cb692b](https://togithub.com/vuejs/vue-devtools/commit/9cb692b3a0d0fd7f75a299dcd1ed563eb89141cd)) - typo in title of welcome slideshow ([#​1818](https://togithub.com/vuejs/vue-devtools/issues/1818)) ([48157f6](https://togithub.com/vuejs/vue-devtools/commit/48157f653fd7e674e63802bf5e9a1355f8560ad3)) - **vue2:** vuex getters undefined check, closes [#​1757](https://togithub.com/vuejs/vue-devtools/issues/1757) ([107589b](https://togithub.com/vuejs/vue-devtools/commit/107589b3517956b1c8afaad2beedc714443d6c17)) ##### Features - **api:** node actions for custom inspector ([#​1820](https://togithub.com/vuejs/vue-devtools/issues/1820)) ([22a1397](https://togithub.com/vuejs/vue-devtools/commit/22a1397f577f8320ac14b31506713c53afb34145)) - multi detector runs, related to [#​1807](https://togithub.com/vuejs/vue-devtools/issues/1807) ([c888003](https://togithub.com/vuejs/vue-devtools/commit/c888003561868bbd2c67e62c996b495c90aa5b32))

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