Update vdiffr svgs after descent changes

[dpseidel]

The changes to descent in #2996 broke numerous vdiffr tests by slightly altering plot height (see screenshots below). This PR updates the svg files.

@thomasp85, I've gone through and inspected the mismatches, all containing the same slight shift, but perhaps you should review to confirm this shift is an expected and acceptable change in plot behavior before we update the test case files.

See slight shift in the xaxis height:

The differences are much more pronounced in the "theme-large" tests, e.g. :

[thomasp85]

For some reason I didn't see any broken tests locally, which surprised me, so thanks for picking that up

[thomasp85]

All of this is within the bounds of acceptable change. Fixing the alignment of text is bound to cause some slight changes

[dpseidel]

Great, thanks! if your local vdiffr version is not up to date, visual tests will be skipped silently so I'd check that first.

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