Upgrade to Spock 1.3-groovy-2.5

Closes gh-18458

spring-boot-project/spring-boot-parent/pom.xml

@@ -25,7 +25,7 @@
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 		<maven.version>3.5.4</maven.version>
 		<maven-resolver.version>1.1.1</maven-resolver.version>
-		<spock.version>1.0-groovy-2.4</spock.version>
+		<spock.version>1.3-groovy-2.5</spock.version>
 		<spring-asciidoctor-extensions.version>0.3.0.BUILD-SNAPSHOT</spring-asciidoctor-extensions.version>
 		<spring-doc-resources.version>0.1.3.RELEASE</spring-doc-resources.version>
 		<spring-doc-resources.url>https://repo.spring.io/release/io/spring/docresources/spring-doc-resources/${spring-doc-resources.version}/spring-doc-resources-${spring-doc-resources.version}.zip</spring-doc-resources.url>
@@ -200,12 +200,6 @@
 				<groupId>org.spockframework</groupId>
 				<artifactId>spock-core</artifactId>
 				<version>${spock.version}</version>
-				<exclusions>
-					<exclusion>
-						<groupId>org.codehaus.groovy</groupId>
-						<artifactId>groovy-all</artifactId>
-					</exclusion>
-				</exclusions>
 			</dependency>
 			<dependency>
 				<groupId>org.spockframework</groupId>