chore: add package-lock.json to generated

Signed-off-by: Victor Adossi <vadossi@cosmonic.com>

Author: vados-cosmonic

.gitattributes

@@ -7,5 +7,8 @@
 # Genrated code from cargo-component
 component-model/examples/tutorial/*/src/bindings.rs linguist-generated
 
+# Generated code from JS tutorial
+component-model/examples/tutorial/jco/package-lock.json linguist-generated
+
 Cargo-component.lock linguist-language=toml