Upgrade to Spring Framework 6.0.0-SNAPSHOT.

Resolves spring-projectsgh-538.

Author: jxblum

pom.xml

@@ -49,6 +49,7 @@
 		<log4j.version>2.16.0</log4j.version>
 		<multithreadedtc.version>1.01</multithreadedtc.version>
 		<snappy.version>0.4</snappy.version>
+		<spring>6.0.0-SNAPSHOT</spring>
 		<springdata.commons>2.7.0-SNAPSHOT</springdata.commons>
 		<spring-shell.version>1.2.0.RELEASE</spring-shell.version>
 	</properties>