Shade json in configuration processor

This commit shades the json API in the configuration processor so that
it doesn't bring `android-json` to the classpath anymore.

Closes gh-10307

spring-boot-parent/src/checkstyle/checkstyle-suppressions.xml

@@ -22,4 +22,5 @@
 	<suppress files="Ansi.*\.java" checks="JavadocStyle" />
 	<suppress files="LogLevel\.java" checks="JavadocVariable" />
 	<suppress files="HelpMojo\.java" checks=".*"/>
+	<suppress files="[\\/]org.springframework.boot.configurationprocessor.json[\\/].*\.java$" checks=".*"/>
 </suppressions>