Log Message:
tex-siunitx{,-doc}: update to 3.3.12

3.3.9
- Rounding of values with no mantissa

3.3.10
- Load `color` package in `begindocument/before` hook
- Normalize exponents when `exponent-mode = threshold`
- Prevent accidental expansion of `\mathord`

3.3.11
- Formatting of units with separated uncertainties in 'compound' structures
  when unit is not repeated

3.3.12
- Normalize active `<`/`>`in numerical input
- Allow for `\protect` inside symbolic units
- Do not error for entirely empty numerical input
- Print all numerical material in math mode when
  `parse-numbers = false` is set