perf: use Array.isArray()

[VIKTORVAV99]

Uses Array.isArray(obj) instead of Object.prototype.toString.apply(object) === '[object Array]' for a small performance and bundle size gain.

By utilising the new native builtin supported by all target browsers we can reduce the previous 3 step operation to 1 step.

Checklist

• only relevant code is changed (make a diff before you submit the PR)
• run tests npm run test
• tests are included
• commit message and code follows the Developer's Certification of Origin

Checklist (for documentation change)

• only relevant documentation part is changed (make a diff before you submit the PR)
• motivation/reason is provided
• commit message and code follows the Developer's Certification of Origin

[coveralls]

coverage: 96.338% (+0.03%) from 96.313%
when pulling c4b4d50 on VIKTORVAV99:use_Array.isArray
into 20011af on i18next:master.

[adrai]

included in v23.11.5