Fix README local Maven install command
Fix README local Maven install command

Switching from the maven to maven-publish plugin means users should use publishToMavenLocal to install jars into their local Maven cache.

Closes gh-10047

jgrandja/spring-security,spring-projects/spring-security,spring-projects/spring-security,spring-projects/spring-security,rwinch/spring-security,spring-projects/spring-security,rwinch/spring-security,jgrandja/spring-security,rwinch/spring-security,djechelon/spring-security,jgrandja/spring-security,jgrandja/spring-security,rwinch/spring-security,jgrandja/spring-security,djechelon/spring-security,jgrandja/spring-security,djechelon/spring-security,spring-projects/spring-security,rwinch/spring-security,rwinch/spring-security,spring-projects/spring-security,djechelon/spring-security,djechelon/spring-security,spring-projects/spring-security