Fix typescript errors with Vue 3

[Demivan]

Fixes #740

[github-actions]

Export Size

Unchanged

fluent-vue

Name	Size	Diff
createFluentVue	1.96 KB	-
useFluent	871 B	-

[codecov]

Codecov Report

Merging #741 (ed02121) into main (1fb3fb5) will decrease coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #741      +/-   ##
==========================================
- Coverage   99.62%   99.43%   -0.19%     
==========================================
  Files          10       10              
  Lines         530      530              
  Branches       82       41      -41     
==========================================
- Hits          528      527       -1     
- Misses          1        3       +2     
+ Partials        1        0       -1     

Flag	Coverage Δ
vue-2	99.43% <ø> (+5.09%)	⬆️
vue-3	98.67% <ø> (+4.15%)	⬆️

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Impacted Files	Coverage Δ
src/getContext.ts	98.38% <0.00%> (-1.62%)	⬇️
src/vue/directive.ts	98.49% <0.00%> (ø)

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