Fixed missing cargo_toml_variable_extractor deps

[UebelAndre]

This fixes issues specifically for missing a rules_rust_ctve repository but others I wouldn't have expected to be missing unless users forgot to add the following to their WORKSPACE.bazel files

load("@rules_rust//cargo:deps.bzl", "cargo_dependencies")

cargo_dependencies()

Users just using crate_universe and not cargo_toml_env_vars directly should be fine using the standard crate_universe setup macros

load("@rules_rust//crate_universe:repositories.bzl", "crate_universe_dependencies")

crate_universe_dependencies()

[illicitonion]

Works for me! Thanks!