ESLint: Unsafe call of an `any` typed value.(@typescript-eslint/no-unsafe-call)

**Describe the bug**

When i using dayjs in React with TypeScript, some errors occur.

- ESLint: Unsafe call of an `any` typed value.(@typescript-eslint/no-unsafe-call)
- ESLint: Unsafe member access .toString on an `any` value.(@typescript-eslint/no-unsafe-member-access)
- ESLint: Unsafe member access .unix on an `any` value.(@typescript-eslint/no-unsafe-member-access)

```typescript
import dayjs from "dayjs";

function getTime(dateTimeStr: string): string {
return dayjs(dateTimeStr).unix().toString();
}
```

**Expected behavior**
There is no lint errors.

**Information**
- Day.js Version [e.g. v1.0.0]: ^1.11.2
- OS: [e.g. iOS] : MacOS BigSur
- Browser [e.g. chrome 62] : 101.0.4951.64 (x86_64)
- Time zone: [e.g. GMT-07:00 DST (Pacific Daylight Time)] KST (korea standard time)
- IDE: WebStorm 2021.2.4
- if you want more information, please notice me! 👏 (e.g. `.eslintrc`, ...)

Start by reproducing the TypeScript example with Day.js 1.11.2 and the reported ESLint rules in an equivalent React setup. Inspect the consumer's TypeScript and ESLint configuration to determine whether the errors come from Day.js typings or project setup; done means the listed unsafe-call and unsafe-member-access errors no longer occur.

Written by the indexing model from the issue text.