Recommende update for rust and cargo

This update updates rust to version 1.23.0 and cargo to version 0.24.0.

These versions are a build dependency for an upcoming update to Mozilla Firefox to version 60 ESR (bsc#1030232).
These sources were imported from the SUSE:SLE-12-SP2:Update update project.

Fixed bugs
bnc#1030232
rust >= 1.24.0 and cargo >= 0.25 required for Firefox 60 ESR
bnc#1075883
rust-std does not get updated together with rust
Selected Binaries
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