Add missing `supports-color` dependency

[erunion]

👋 Our package-lock.json file is a mess for a variety of reasons I won't bore you with but while removing an ancient version of webpack-dev-server that used supports-color from our application it ended up deleting node_modules/supports-color; however because Alex has an implicit dependency on this by way of vfile-reporter it left node_modules/vfile-reporter/node_modules/supports-color alone.

Unfortunately because this is an implicit and not an explicit dependency Alex began to throw the following error for us:

node:internal/modules/esm/resolve:853
  throw new ERR_MODULE_NOT_FOUND(packageName, fileURLToPath(base), null);
        ^

Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'supports-color' imported from /Users/erunion/redacted/path/to/codebase/node_modules/alex/cli.js
    at packageResolve (node:internal/modules/esm/resolve:853:9)
    at moduleResolve (node:internal/modules/esm/resolve:910:20)
    at defaultResolve (node:internal/modules/esm/resolve:1130:11)
    at ModuleLoader.defaultResolve (node:internal/modules/esm/loader:396:12)
    at ModuleLoader.resolve (node:internal/modules/esm/loader:365:25)
    at ModuleLoader.getModuleJob (node:internal/modules/esm/loader:240:38)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/module_job:85:39)
    at link (node:internal/modules/esm/module_job:84:36) {
  code: 'ERR_MODULE_NOT_FOUND'
}

Node.js v20.11.1

Installing supports-color as a development dependency of our application places supports-color back into the root node_modules directory and makes Alex work again.

Because Alex directly depends on this module it should list it as an explicit dependency.

[wooorm]

Thanks! :)