upgrade vue-muliselect to beta for Vue 3 support

[RayBB]

Contributes to #7547

Upgrades vue-multiselect to beta version for Vue 3 support.

According to the docs here the main change is that:

input is now update:modelValue. This is so v-model works in Vue 3.

But we don't use input in the muliselect right now so we should have no problems.

Technical

Using isn't ideal but it's better than migrating to another component right now.

Testing

Use language selector in library explorer.

Screenshot

Stakeholders

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 17.44%. Comparing base (3025f5d) to head (a6ac071).
Report is 38 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8384   +/-   ##
=======================================
  Coverage   17.44%   17.44%           
=======================================
  Files          89       89           
  Lines        4792     4792           
  Branches      848      848           
=======================================
  Hits          836      836           
  Misses       3436     3436           
  Partials      520      520           

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[RayBB]

Updated to the new non-beta version and it works well.
@jimchamp can you review when you get a chance? :)

[RayBB]

@cdrini assigning you as @jimchamp mentioned that you'll need to take the final look at this one

[cdrini]

No luck I'm afraid 😁 From testing:

[RayBB]

This will never work because we need everything upgraded at once. Closing in favor of #10298