Update the version of Dokka in Playground.

Test: N/A
Change-Id: I8f68a4aa78ef567cff22b6c986469a645b309ec9
diff --git a/playground-common/playground.properties b/playground-common/playground.properties
index 3d45275..1ee7e5b 100644
--- a/playground-common/playground.properties
+++ b/playground-common/playground.properties
@@ -41,5 +41,5 @@
 androidx.coverageEnabled=false
 androidx.playground.snapshotBuildId=6543454
 androidx.playground.metalavaBuildId=6604778
-androidx.playground.dokkaBuildId=6402791
+androidx.playground.dokkaBuildId=6656073
 androidx.studio.type=playground