Upgrade to Spring Plugin 4.0 RC1.

Fixes GH-2680.

Author: odrotbohm

parent/pom.xml

@@ -144,7 +144,7 @@
 		<maven-antora>1.0.0-alpha.4</maven-antora>
 		<spring-asciidoctor-backends.version>0.0.7</spring-asciidoctor-backends.version>
 		<spring-hateoas>3.0.0-M5</spring-hateoas>
-		<spring-plugin>4.0.0-M1</spring-plugin>
+		<spring-plugin>4.0.0-RC1</spring-plugin>
 		<servlet-api>6.0.0</servlet-api>
 		<testcontainers>1.21.3</testcontainers>
 		<validation>3.0.2</validation>