Move sub-crates to workspace dependencies (#11407)

## Summary

This matches the setup we use in `uv` and allows for consistency in the
`Cargo.toml` files.

crates/ruff_python_literal/Cargo.toml

@@ -15,7 +15,7 @@ license = { workspace = true }
 doctest = false
 
 [dependencies]
-ruff_python_ast = { path = "../ruff_python_ast" }
+ruff_python_ast = { workspace = true }
 
 bitflags = { workspace = true }
 hexf-parse = { workspace = true }