gnu: librsvg-next: Update to 2.50.1.

* gnu/packages/gnome.scm (librsvg-next): Update to 2.50.1.
[arguments]: Build with rust-1.40. In cargo-inputs remove
rust-downcast-1.1. Replace rust-float-cmp-0.6 with 0.8,
rust-itertools-0.8 with 0.9, rust-nalgebra-0.19 with 0.21. Add
rust-string-cache-0.8, rust-tinyvec-0.3. In cargo-development-inputs add
rust-assert-cmd-1, rust-chrono-0.4, rust-float-cmp-0.8, rust-lopdf-0.25,
rust-png-0.16, rust-predicates-1, rust-tempfile-3. Add phase to work
around failing tests.

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