Fix footer year typo from 2022 to 2023 in README#1180

yashg12 wants to merge 1 commit intoibm-developer-skills-network:mainibm-developer-skills-network/mcino-Introduction-to-Git-and-GitHub:mainfrom

yashg12:bug-fix-typoyashg12/mcino-Introduction-to-Git-and-GitHub:bug-fix-typoCopy head branch name to clipboard