[12.x] Allow brick/math ^0.13

[jnoordsij]

See https://github.com/brick/math/releases/tag/0.13.0.

Note this first requires ramsey/uuid#589 and subsequent release to be effective.

> composer why-not brick/math ^0.13
ramsey/uuid 4.7.6 requires brick/math (^0.8.8 || ^0.9 || ^0.10 || ^0.11 || ^0.12)
Not finding what you were looking for? Try calling `composer require "brick/math:^0.13" --dry-run` to get another view on the problem.

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[jnoordsij]

With the release of https://github.com/ramsey/uuid/releases/tag/4.8.0 this should now be mergeable.

I've just rebased to ensure tests run on the latest codestate.

[taylorotwell]

Thanks!