Move more dependencies to workspace level (#12270)

# Description
This is a followup to #12043 that moves more dependency versions to
workspace dependencies.

# User-Facing Changes
N/A

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

crates/nu-system/Cargo.toml

@@ -13,7 +13,7 @@ license = "MIT"
 bench = false
 
 [dependencies]
-libc = "0.2"
+libc = { workspace = true }
 log = { workspace = true }
 sysinfo = { workspace = true }
 
@@ -21,17 +21,17 @@ sysinfo = { workspace = true }
 nix = { workspace = true, default-features = false, features = ["fs", "term", "process", "signal"] }
 
 [target.'cfg(any(target_os = "linux", target_os = "android"))'.dependencies]
-procfs = "0.16"
+procfs = { workspace = true }
 
 [target.'cfg(target_os = "macos")'.dependencies]
-libproc = "0.14"
-mach2 = "0.4"
+libproc = { workspace = true }
+mach2 = { workspace = true }
 
 [target.'cfg(target_os = "windows")'.dependencies]
 chrono = { workspace = true, default-features = false, features = ["clock"] }
 ntapi = "0.4"
 once_cell = { workspace = true }
-windows = { version = "0.54", features = [
+windows = { workspace = true, features = [
   "Wdk_System_SystemServices",
   "Wdk_System_Threading",
   "Win32_Foundation",