Update Vue and related dependencies

This MR contains the following updates:

Package	Type	Update	Change
vue	dependencies	patch	^2.6.10 -> ^2.6.12
vue-loader	dependencies	patch	^15.9.0 -> ^15.9.3
vue-template-compiler	dependencies	patch	^2.6.10 -> ^2.6.12

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

vuejs/vue

v2.6.12

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v2.6.11

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Security Fixes

• Bump vue-server-renderer's dependency of serialize-javascript to 2.1.2

Bug Fixes

• types: fix prop constructor type inference (#​10779) 4821149, closes #​10779
• fix function expression regex (#​9922) 569b728, closes #​9922 #​9920
• compiler: Remove the warning for valid v-slot value (#​9917) 085d188, closes #​9917
• types: fix global namespace declaration for UMD bundle (#​9912) ab50e8e, closes #​9912

vuejs/vue-loader

v15.9.3

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Bug Fixes

• skip matching rule with 'enforce' (e7b2b11), closes #​1680

v15.9.2

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Bug Fixes

• fix getting shadow root when component is functional (#​1560) (9a7357a)

Documentation

• add DocSearch as recommended by vuepress (#​1662) (032d56b)

v15.9.1

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Bug Fixes

• ensure unique ident when cloning rules, fix webpack 5 compatibility (#​1653) (84c34a4)

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