arrow_up: bump spring-boot from 2.7.3 to 2.7.4
<flatten-maven-plugin.version>1.2.7</flatten-maven-plugin.version>
<spring-javaformat-checkstyle.version>0.0.34</spring-javaformat-checkstyle.version>
- <spring-boot.version>2.7.3</spring-boot.version>
+ <spring-boot.version>2.7.4</spring-boot.version>
<spring-security-oauth2.version>2.5.2.RELEASE</spring-security-oauth2.version>
<springfox.version>3.0.0</springfox.version>
<swagger.version>1.5.21</swagger.version>
