Introduce workspace dependencies (#12043)

# Description
This PR introduces [workspaces
dependencies](https://doc.rust-lang.org/cargo/reference/workspaces.html#the-dependencies-table).
The advantages are:
- a single place where dependency versions are declared
- reduces the number of files to change when upgrading a dependency
- reduces the risk of accidentally depending on 2 different versions of
the same dependency

I've only done a few so far. If this PR is accepted, I might continue
and progressively do the rest.

# User-Facing Changes
N/A

# Tests + Formatting
- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`

# After Submitting
N/A

crates/nu-pretty-hex/Cargo.toml

@@ -14,7 +14,7 @@ path = "src/lib.rs"
 bench = false
 
 [dependencies]
-nu-ansi-term = "0.50.0"
+nu-ansi-term = { workspace = true }
 
 [dev-dependencies]
 heapless = { version = "0.8", default-features = false }