chore(deps): Update Rust crate convert_case to 0.8

Author: renovate[bot]

Cargo.lock

@@ -142,7 +142,7 @@ rust-ini = { version = "0.21", optional = true }
 ron = { version = "0.8", optional = true }
 json5_rs = { version = "0.4", optional = true, package = "json5" }
 indexmap = { version = "2.10.0", features = ["serde"], optional = true }
-convert_case = { version = "0.6", optional = true }
+convert_case = { version = "0.8", optional = true }
 pathdiff = "0.2"
 winnow = "0.7.0"