Update guava to 23.2-jre, place under dependencyManagement

This is to fix guava #2152 which causes ClassPath to return an empty list when the path of the classloader contains special characters

cache/pom.xml

@@ -52,7 +52,6 @@
 		<dependency>
 			<groupId>com.google.guava</groupId>
 			<artifactId>guava</artifactId>
-			<version>21.0</version>
 		</dependency>
 		<dependency>
 			<groupId>org.slf4j</groupId>

http-service/pom.xml

@@ -87,7 +87,6 @@
 		<dependency>
 			<groupId>com.google.guava</groupId>
 			<artifactId>guava</artifactId>
-			<version>21.0</version>
 		</dependency>
 		<dependency>
 			<groupId>org.slf4j</groupId>

pom.xml

@@ -118,6 +118,16 @@
 		<module>runelite-proxy</module>
 	</modules>
 
+	<dependencyManagement>
+		<dependencies>
+			<dependency>
+				<groupId>com.google.guava</groupId>
+				<artifactId>guava</artifactId>
+				<version>23.2-jre</version>
+			</dependency>
+		</dependencies>
+	</dependencyManagement>
+
 	<build>
 		<plugins>
 			<plugin>

runelite-client/pom.xml

@@ -61,7 +61,6 @@
 		<dependency>
 			<groupId>com.google.guava</groupId>
 			<artifactId>guava</artifactId>
-			<version>21.0</version>
 		</dependency>
 		<dependency>
 			<groupId>com.google.code.gson</groupId>

runelite-proxy/pom.xml

@@ -56,7 +56,6 @@
 		<dependency>
 			<groupId>com.google.guava</groupId>
 			<artifactId>guava</artifactId>
-			<version>21.0</version>
 		</dependency>
 
 		<dependency>