fix: update year in footer to 2023#43608

jhoundofi wants to merge 1 commit intoibm-developer-skills-network:masteribm-developer-skills-network/jbbmo-Introduction-to-Git-and-GitHub:masterfrom

jhoundofi:bug-fix-typojhoundofi/jbbmo-Introduction-to-Git-and-GitHub:bug-fix-typoCopy head branch name to clipboard