GH-2303 - Upgrade to Spring Plugin 4.0 M1.

Author: odrotbohm

Diff for: pom.xml

@@ -84,7 +84,7 @@
 		<reactor-bom.version>2024.0.5</reactor-bom.version>
 		<slf4j.version>2.0.17</slf4j.version>
 		<spring.version>7.0.0-M4</spring.version>
-		<spring-plugin.version>4.0.0-SNAPSHOT</spring-plugin.version>
+		<spring-plugin.version>4.0.0-M1</spring-plugin.version>
 		<kotlin.version>2.1.20</kotlin.version>
 		<kotlinx-coroutines.version>1.10.2</kotlinx-coroutines.version>
 		<mockk.version>1.14.0</mockk.version>