deps: upgrade to svgo v3.0.5

[SethFalco]

This upgrades SVGOMG to use the latest release of SVGO, v3.0.5.

The maintainers (including myself) have spent quite a lot of time resolving some of the long-term bugs that have encumbered the project, particularly in the last two releases. This should resolve some issues reported by users here as well.

• https://github.com/svg/svgo/releases/tag/v3.0.3
• https://github.com/svg/svgo/releases/tag/v3.0.4
• https://github.com/svg/svgo/releases/tag/v3.0.5

I've also made some small changes:

• In SVGO v3.0.0, the cleanupIDs plugin was renamed to cleanupIds, this updates the config to apply that change.
• Move the sort* plugins to the end, as this is where they work best.
• Add the two new plugins (disabled by default) to the list, convertOneStopGradients and removeXlink.

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[SethFalco]

Closing as this is no longer relevant.