dependencies: Move @babel/register to devDependencies.

This is not needed in production as of #32327.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

package.json

@@ -6,7 +6,6 @@
     "@babel/core": "^7.5.5",
     "@babel/preset-env": "^7.5.5",
     "@babel/preset-typescript": "^7.15.0",
-    "@babel/register": "^7.6.2",
     "@fontsource-variable/open-sans": "^5.0.9",
     "@formatjs/intl": "^3.0.1",
     "@gfx/zopfli": "^1.0.15",
@@ -96,6 +95,7 @@
   },
   "devDependencies": {
     "@babel/plugin-transform-modules-commonjs": "^7.19.6",
+    "@babel/register": "^7.6.2",
     "@eslint/eslintrc": "^3.2.0",
     "@eslint/js": "^9.15.0",
     "@formatjs/cli": "^6.0.0",