Make Jest available to javadoc generation

See gh-6032

spring-boot-docs/pom.xml

@@ -85,6 +85,11 @@
 			<artifactId>jackson-dataformat-xml</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>com.github.ben-manes.caffeine</groupId>
+			<artifactId>caffeine</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>com.google.code.gson</groupId>
 			<artifactId>gson</artifactId>
@@ -161,6 +166,11 @@
 				</exclusion>
 			</exclusions>
 		</dependency>
+		<dependency>
+			<groupId>io.searchbox</groupId>
+			<artifactId>jest</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>io.undertow</groupId>
 			<artifactId>undertow-websockets-jsr</artifactId>