Bump up Spring Boot to version 2.7.3
Bump up Spring Boot to version 2.7.3

jvm-bloggers#738

jvm-bloggers/jvm-bloggers,jvm-bloggers/jvm-bloggers,kraluk/jvm-bloggers,kraluk/jvm-bloggers,kraluk/jvm-bloggers,kraluk/jvm-bloggers,jvm-bloggers/jvm-bloggers,jvm-bloggers/jvm-bloggers