Toolset 3.0.3 released

[Alex Cabal]

Upgrade using `pipx upgrade standardebooks`.

This is a bug fix release.

Changelog:

# 3.0.3

## se build

- Improve CSS simplification when !important is involved

## se build-images

- Reorder lines in edge case with short top and longer bottom that
contains a colon

## se lint

- Improve s-025

- Allow Wikisource page scans in m-037

- Correctly output unused codes that occur in more than one line

- Improve t-005 and rename to y-037

- Improve t-004

- Fix broken m-035

## se recompose-epub

- Fix broken data string when inlining SVGs

## se modernize-spelling

- Various additions