Bump `@sindresorhus/is` to latest

[ikelax]

Currently, we have to use the .default before every property of is, because we're on an older version of @sindresorhus/is that doesn't set up ESM defaults properly yet. An example for this can be found in src/search.ts.

By bumping @sindresorhus/is to latest, we could avoid this.

See also: @JoshuaKGoldberg in #204 (comment)

[JoshuaKGoldberg]

Agreed, that'd be great. The one tricky thing would be making sure it doesn't change Node.js support for node-emoji itself:

• Minimum Node.js version: not raising it
• CJS/ESM: not-old versions of @sindresorthus/* packages don't support CJS natively

...so if either of this being broken is a prerequisite for a version of @sindresorhus/is that fixes the .default shenanigan, then this'd be a breaking change for the next major version.