Fix typo: updated footer year to 2023#42298

ombhadane29 wants to merge 1 commit intoibm-developer-skills-network:masteribm-developer-skills-network/jbbmo-Introduction-to-Git-and-GitHub:masterfrom

ombhadane29:bug-fix-typoombhadane29/jbbmo-Introduction-to-Git-and-GitHub:bug-fix-typoCopy head branch name to clipboard