Fix mock OAuth2 server to return valid JWTs instead of plain strings#4

chrisw-dev merged 4 commits intomainchrisw-dev/golang-mock-oauth2-server:mainfrom

copilot/fix-mock-oauth-server-jwtchrisw-dev/golang-mock-oauth2-server:copilot/fix-mock-oauth-server-jwtCopy head branch name to clipboard