fix #770 - update okhttp-digest to 1.14 and update other okhttp libs to the latest

(cherry picked from commit 4893911)

Author: sammefford

pom.xml

@@ -261,17 +261,17 @@
 		<dependency>
 			<groupId>com.squareup.okhttp3</groupId>
 			<artifactId>okhttp</artifactId>
-			<version>3.6.0</version>
+			<version>3.8.1</version>
 		</dependency>
 		<dependency>
 			<groupId>com.squareup.okhttp3</groupId>
 			<artifactId>logging-interceptor</artifactId>
-			<version>3.6.0</version>
+			<version>3.8.1</version>
 		</dependency>
 		<dependency>
 			<groupId>com.burgstaller</groupId>
 			<artifactId>okhttp-digest</artifactId>
-			<version>1.12</version>
+			<version>1.14</version>
 		</dependency>
 		<dependency>
 			<groupId>com.sun.mail</groupId>