Put Rust deps at the root of the workspace

This allows us to be consistent about the required versions for each of
the member packages.

Fixes #3088.

Cargo.toml

@@ -10,3 +10,34 @@ members = [
 
 # src/tc/rust is just part of the TW build and not a public crate
 exclude = [ "src/tc/rust" ]
+
+# All Rust dependencies are defined here, and then referenced by the
+# Cargo.toml's in the members with `foo.workspace = true`.
+[workspace.dependencies]
+actix-rt = "2"
+actix-web = "^4.3.1"
+anyhow = "1.0"
+byteorder = "1.0"
+cc = "1.0.73"
+chrono = { version = "^0.4.22", features = ["serde"] }
+clap = { version = "^4.3.0", features = ["string"] }
+env_logger = "^0.10.0"
+ffizz-header = "0.3"
+flate2 = "1"
+futures = "^0.3.25"
+lazy_static = "1"
+libc = "0.2.136"
+log = "^0.4.17"
+pretty_assertions = "1"
+proptest = "^1.2.0"
+ring = "0.16"
+rstest = "0.17"
+rusqlite = { version = "0.29", features = ["bundled"] }
+serde_json = "^1.0"
+serde = { version = "^1.0.147", features = ["derive"] }
+strum = "0.25"
+strum_macros = "0.25"
+tempfile = "3"
+thiserror = "1.0"
+ureq = "^2.7.0"
+uuid = { version = "^1.3.0", features = ["serde", "v4"] }