Update dependency vue-multiselect to v2.1.9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
vue-multiselect (source)	2.1.7 -> 2.1.9

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Release Notes

shentao/vue-multiselect (vue-multiselect)

### [`v2.1.9`](https://togithub.com/shentao/vue-multiselect/releases/tag/v2.1.9) [Compare Source](https://togithub.com/shentao/vue-multiselect/compare/v2.1.8...v2.1.9) #### What's Changed - fix: default group deselect by [@​akki-jat](https://togithub.com/akki-jat) in [https://github.com/shentao/vue-multiselect/pull/1754](https://togithub.com/shentao/vue-multiselect/pull/1754) **Full Changelog**: https://github.com/shentao/vue-multiselect/compare/v2.1.8...v2.1.9 ### [`v2.1.8`](https://togithub.com/shentao/vue-multiselect/releases/tag/v2.1.8) [Compare Source](https://togithub.com/shentao/vue-multiselect/compare/v2.1.7...v2.1.8) #### What's Changed - Fix(1716): null.blur() on special occasions by [@​malarium](https://togithub.com/malarium) in [https://github.com/shentao/vue-multiselect/pull/1717](https://togithub.com/shentao/vue-multiselect/pull/1717) #### New Contributors - [@​malarium](https://togithub.com/malarium) made their first contribution in [https://github.com/shentao/vue-multiselect/pull/1717](https://togithub.com/shentao/vue-multiselect/pull/1717) **Full Changelog**: https://github.com/shentao/vue-multiselect/compare/v2.1.7...v2.1.8

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