Do not enable spring javaformat plugin

We do not use the plugin, but rather apply some checkstyle rules that
should be available on the classpath.

Closes gh-31448

buildSrc/build.gradle

@@ -1,7 +1,6 @@
 plugins {
 	id 'java-gradle-plugin'
 	id 'checkstyle'
-	id 'io.spring.javaformat' version "${javaFormatVersion}"
 }
 
 repositories {