Rollup merge of #93551 - GuillaumeGomez:ignore-package-json, r=Mark-Simulacrum

Add package.json in gitignore

It happened a few times (last one is https://github.com/rust-lang/rust/pull/93537/files#r796757998) so I think it's fine to ignore this file to prevent it to happen again in the future. :)

r? ```@Mark-Simulacrum```

Author: matthiaskrgr

.gitignore

@@ -71,6 +71,7 @@ __pycache__/
 ## Node
 node_modules
 package-lock.json
+package.json
 
 ## Rustdoc GUI tests
 src/test/rustdoc-gui/src/**.lock