rust: synchronize dependencies between subprojects and Cargo.lock

The next commit will introduce a new build.rs dependency for rust/qemu-api,
version_check.  Before adding it, ensure that all dependencies are
synchronized between the Meson- and cargo-based build systems.

Note that it's not clear whether in the long term we'll use Cargo for
anything; it seems that the three main uses (clippy, rustfmt, rustdoc)
can all be invoked manually---either via glue code in QEMU, or by
extending Meson to gain the relevant functionality.  However, for
the time being we're stuck with Cargo so it should at least look at
the same code as the rest of the build system.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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