message: CLI: Strip invalid characters from suggested stage name
diff: @@ -37,10 +37,10 @@ export function setStage(root: string, stage: string) {
  export async function suggestStage() {
  const client = new STS();
  - try {
  - const result = await client.getCallerIdentity().promise();
  - return path.basename(result.Arn!);
  - } catch {
  - return os.userInfo().username;
  - }
  + const result = await client
  + .getCallerIdentity()
  + .promise()
  + .then((result) => path.basename(result.Arn!))
  + .catch(() => os.userInfo().username);
  + return result.replaceAll(/[^A-Za-z0-9]/g, "-");
  }
  