Add github actions workflow for unused deps (#7681)

Signed-off-by: Rodolfo Olivieri <rodolfo.olivieri3@gmail.com>

Cargo.toml

@@ -1,5 +1,9 @@
 [workspace]
-members = ["crates/*"]
+members = [
+    "crates/*", 
+    # Mainly for cargo-machete to not error out during inspection.
+    "vendor/v8"
+]
 resolver = "2"
 
 [workspace.package]
@@ -84,4 +88,4 @@ tree-sitter-swift = "0.7"
 tree-sitter-typescript = "0.23"
 
 [patch.crates-io]
-v8 = { path = "vendor/v8" }
+v8 = { path = "vendor/v8" }