Remove unused dependency (#23)

Cargo.lock

@@ -84,12 +84,6 @@ dependencies = [
  "windows-sys",
 ]
 
-[[package]]
-name = "cov-mark"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0570650661aa447e7335f1d5e4f499d8e58796e617bedc9267d971e51c8b49d4"
-
 [[package]]
 name = "cpufeatures"
 version = "0.2.17"
@@ -565,7 +559,6 @@ name = "tree-house"
 version = "0.3.0"
 dependencies = [
  "arc-swap",
- "cov-mark",
  "hashbrown",
  "indexmap",
  "kstring",

highlighter/Cargo.toml

@@ -28,7 +28,6 @@ pretty_assertions = { version = "1.4.0", optional = true }
 kstring = "2.0"
 
 [dev-dependencies]
-cov-mark = "2.0.0"
 indexmap = "2.5.0"
 skidder = { path = "../skidder" }