Bug#1143411: rust-asn1-rs: FTBFS: error: failed to select a version for the requirement `hex-literal = "^0.4"`

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tags 1143411 +patch
thanks

> error: failed to select a version for the requirement `hex-literal = "^0.4"`
> candidate versions found which didn't match: 1.1.0
> location searched: directory source `/<<PKGBUILDDIR>>/debian/cargo_registry` (which is replacing registry `crates-io`)

As well as causing a FTBFS, this also causes an autopkgtest failure, which is
blocking the migration of the new version of rust-hex-literal to testing.

The fix is a trivial bump of the cargo dev-dependency, I have attatched
a debdiff to this mail and if I get no response will probablly NMU in a
week or so.


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