Upgrade to Spring Framework 6.0.0-M6.

Resolves #1259.

Author: gregturn

pom.xml

@@ -111,7 +111,7 @@
         <saaj-impl.version>2.0.1</saaj-impl.version>
         <slf4j.version>1.7.32</slf4j.version>
         <smack.version>4.2.1</smack.version>
-        <spring.version>6.0.0-M3</spring.version>
+        <spring.version>6.0.0-M6</spring.version>
         <spring-security.version>6.0.0-M1</spring-security.version>
         <stax.version>2.0.1</stax.version>
         <woodstox.version>4.2.0</woodstox.version>