Only pick up new maintenance releases when upgrading dependencies

Closes gh-24069

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -9,7 +9,7 @@ description = "Spring Boot Dependencies"
 bom {
 	effectiveBomArtifact()
 	upgrade {
-		policy = "same-major-version"
+		policy = "same-minor-version"
 		gitHub {
 			issueLabels = ["type: dependency-upgrade"]
 		}

spring-boot-project/spring-boot-parent/build.gradle

@@ -8,7 +8,7 @@ description = "Spring Boot Parent"
 
 bom {
 	upgrade {
-		policy = "same-major-version"
+		policy = "same-minor-version"
 		gitHub {
 			issueLabels = ["type: task"]
 		}