Correct optional dependency declarations in spring-boot-test-support

Closes gh-15371

spring-boot-project/spring-boot-tools/spring-boot-test-support/pom.xml

@@ -82,10 +82,12 @@
 		<dependency>
 			<groupId>com.datastax.cassandra</groupId>
 			<artifactId>cassandra-driver-core</artifactId>
+			<optional>true</optional>
 		</dependency>
 		<dependency>
 			<groupId>org.neo4j</groupId>
 			<artifactId>neo4j-ogm-core</artifactId>
+			<optional>true</optional>
 		</dependency>
 		<dependency>
 			<groupId>javax.servlet</groupId>
@@ -110,6 +112,7 @@
 		<dependency>
 			<groupId>org.testcontainers</groupId>
 			<artifactId>testcontainers</artifactId>
+			<optional>true</optional>
 		</dependency>
 		<!-- Provided -->
 		<dependency>