chore: bump ably-java to 1.6

Author: ttypic

src/data/languages/languageData.ts

@@ -9,8 +9,8 @@ export default {
     react: '2.16',
     csharp: '1.2',
     flutter: '1.2',
-    java: '1.4',
-    kotlin: '1.4',
+    java: '1.6',
+    kotlin: '1.6',
     objc: '1.2',
     php: '1.1',
     python: '2.1',
@@ -25,8 +25,8 @@ export default {
     react: '2.16',
     csharp: '1.2',
     flutter: '1.2',
-    java: '1.4',
-    kotlin: '1.4',
+    java: '1.6',
+    kotlin: '1.6',
     objc: '1.2',
     php: '1.1',
     python: '2.1',
@@ -52,7 +52,7 @@ export default {
   liveObjects: {
     javascript: '2.16',
     swift: '0.2',
-    java: '1.4',
+    java: '1.6',
   },
   liveSync: {
     javascript: '0.4',