fix(deps): update dependency is-plain-object to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
is-plain-object	^3.0.0 -> ^5.0.0

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Release Notes

jonschlinkert/is-plain-object

v5.0.0

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• Migrated from default to named export (see why here https://github.com/lukeed/klona/pull/17):

ESM/TypeScript

- import isPlainObject from 'is-plain-object';
+ import { isPlainObject } from 'is-plain-object';

CommonJS

- const isPlainObject = require('is-plain-object');
+ const { isPlainObject } = require('is-plain-object');

• Added native ESM support via exports mapping

v4.1.1

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v4.1.0

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Reduced size and added type guide to ts definition (thanks to @​lifeiscontent)

v4.0.0

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In this release Object.create(null) is considered as plain object as well.

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