Changes the default fetcher in the Rust Platform to be the newer
`fetchCargoTarball`, and changes every application using the current default to
instead opt out.
This commit does not change any hashes or cause any rebuilds. Once integrated,
we will start deleting the opt-outs and recomputing hashes.
See #79975 for details.
See https://hydra.nixos.org/build/102480738
Bumping to latest version (which is 0.4.2 according to Cargo.lock) fixes
the build error. As no dependency changes happened, cargoSha256 doesn't
need to be updated.
ZHF #68361
