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_plugin_formats/Cargo.toml

@@ -12,7 +12,7 @@ version = "0.91.1"
 nu-plugin = { path = "../nu-plugin", version = "0.91.1" }
 nu-protocol = { path = "../nu-protocol", version = "0.91.1", features = ["plugin"] }
 
-indexmap = "2.2"
+indexmap = { workspace = true }
 eml-parser = "0.1"
 ical = "0.10"
 rust-ini = "0.20.0"