Run npm audit

This syncs our dependencies to the latest version. There is still
a reported vulnerability in postcss, but we are luckily unaffected.
However, we can't upgrade postcss yet, as stylelint requires it
and can not use postcss 8 yet:
https://github.com/stylelint/stylelint/issues/4942#issuecomment-823513767

Also updated manage_node_deps.py to not run the full install when
running `ls`, to allow for easier inspection of our dependency graph.

R=jacktfranklin@chromium.org

Bug: none
Change-Id: I1c9e4836fca25500e2e7277ec82b13bf2b881dca
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2887731
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
Commit-Queue: Jack Franklin <jacktfranklin@chromium.org>
Auto-Submit: Tim van der Lippe <tvanderlippe@chromium.org>
Reviewed-by: Jack Franklin <jacktfranklin@chromium.org>
diff --git a/node_modules/stylelint/lib/cli.js b/node_modules/stylelint/lib/cli.js
index 958162c..efaaea2 100644
--- a/node_modules/stylelint/lib/cli.js
+++ b/node_modules/stylelint/lib/cli.js
@@ -509,8 +509,8 @@
 					} else if (maxWarnings !== undefined && linted.maxWarningsExceeded) {
 						const foundWarnings = linted.maxWarningsExceeded.foundWarnings;
 
-						process.stdout.write(
-							`${chalk.red(`Max warnings exceeded: `)}${foundWarnings} found. ${chalk.dim(
+						process.stderr.write(
+							`${EOL}${chalk.red(`Max warnings exceeded: `)}${foundWarnings} found. ${chalk.dim(
 								`${maxWarnings} allowed${EOL}${EOL}`,
 							)}`,
 						);