Loosen `react/jsx-no-useless-fragment`

[fregante]

The rule fails on <>{children}</>, but that's required for the types

• https://github.com/jsx-eslint/eslint-plugin-react/issues/2584

Follows:

• 195

Blocks:

• https://github.com/pixiebrix/pixiebrix-extension/pull/7451

Some context:

• https://stackoverflow.com/a/70895599/288906