Weekly cargo update of fuzzing dependencies (#741)

Automation to keep dependencies in the fuzzing `Cargo.lock` current.

The following is the output from `cargo update`:

```txt
     Locking 3 packages to latest compatible versions
    Updating cc v1.2.13 -> v1.2.14
    Updating equivalent v1.0.1 -> v1.0.2
    Updating smallvec v1.13.2 -> v1.14.0
note: pass `--verbose` to see 1 unchanged dependencies behind latest
```

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