fix: Change numeric option from auto to always for format.relativeTime

[amannn]

Fixes #757

Previously, numeric: 'auto' was used for formatting relative times. This occasionally produces incorrect output when values are rounded based on the unit, therefore it's changed to always now. The only exception are cases <1s which render as "now" via numeric: 'auto' (instead of "0 seconds ago").

Previous behavior:

// Output: "Last year"
format.relativeTime(
  new Date("2022-07-11T00:00:00.000Z"),
  new Date("2024-01-17T00:00:00.000Z")
);

New behavior:

// Output: "1 year ago"
format.relativeTime(
  new Date("2022-07-11T00:00:00.000Z"),
  new Date("2024-01-17T00:00:00.000Z")
);

Note that this is considered as "1 year" due to rounding. Once a difference of 1.5 years is reached, then "2 years ago" will be displayed.

---

See also these tests from the latest version of next-intl in comparison to date-fns: https://codesandbox.io/p/devbox/lm6svh?file=%2Fsrc%2FApp.tsx%3A30%2C14

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