build(deps): update dependency fonttools to >=4.56.0,<5.0.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
fonttools	>=4.55.8,<5.0.0 -> >=4.56.0,<5.0.0

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Release Notes

fonttools/fonttools (fonttools)

v4.56.0

Compare Source

• [varStore] Sort the input todo list with the same sorting key used for the opimizer's output (#​3767).
• [otData] Fix DeviceTable's DeltaValue repeat value which caused a crash after importing from XML and then compiling a GPOS containing Device tables (#​3758).
• [feaLib] Make FeatureLibError pickleable, so client can e.g. use feaLib to can compile features in parallel with multiprocessing (#​3762).
• [varLib/gvar] Removed workaround for old, long-fixed macOS bug about composite glyphs with all zero deltas (#​1381, #​1788).
• [Docs] Updated ttLib documentation, beefed up TTFont and TTGlyphSet explanations (#​3720).

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