[cli] Change error message from Error! to Error: (#8498)

We have code that tries to detect and highlight errors in the build logs, however it doesn't look for `Error!`, only `Error:`.

We could update that highlight code or we could update Vercel CLI to make it consistent.

This PR is the latter.

packages/cli/src/util/output/create-output.ts

@@ -73,7 +73,7 @@ export class Output {
     link?: string,
     action = 'Learn More'
   ) => {
-    this.print(`${chalk.red(`Error!`)} ${str}\n`);
+    this.print(`${chalk.red(`Error:`)} ${str}\n`);
     const details = slug ? `https://err.sh/vercel/${slug}` : link;
     if (details) {
       this.print(`${chalk.bold(action)}: ${renderLink(details)}\n`);