meson: update meson_version to 0.59
Mesa has updated it's meson_version to 0.59, so let's do the same for this project. After all, the current value was set to the same as what Mesa was using at the time.
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Mesa has updated it's meson_version to 0.59, so let's do the same for this project. After all, the current value was set to the same as what Mesa was using at the time.