PIN: svgutils to previous versions

[mgxd]

See #595 for context

[codecov-io]

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@@              Coverage Diff               @@
##             maint/1.3.x     #596   +/-   ##
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reportlettests	100.00% <0.00%> (?)
unittests	47.14% <0.00%> (?)

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[effigies]

In retrospect, maybe just pinning !=0.3.2 would be safer. An == is fragile for a dependency instead of a user facing app.

[mgxd]

Yeah, definitely more room for error. Do you feel strongly about changing it, or shall we just wait for a new svgutils release?

[effigies]

I don't think it's urgent to change before they release, but I don't think we should release a library with an == dependency, so any niworkflows release process should include updating to !=0.3.2. (Since they're fixing now, I think we can safely ignore the possibility of a broken 0.3.3 or 0.4.0.)