BEAM-13159 Update embedded-redis dependency

The io.oden/embedded-redis artifact was provided by me as part of
landing BEAM-13159, as the previously used version did not use a recent
enough version of Redis to support the XADD/XRANGE command set and also
had a fatal crash bug on darwin/arm64 ("Apple Silicon").

My fork in turn was based on the signal.org artifact, which had a more
recent redis version but was still affected by the crash bug.  Now that
signalapp/embedded-redis#12 has landed, the
io.oden artifact is unlikely to be upgraded further; beam should use the
dependency that is actively maintained.

sdks/java/io/redis/build.gradle

@@ -28,7 +28,7 @@ dependencies {
   implementation "redis.clients:jedis:4.0.1"
   testImplementation project(path: ":sdks:java:io:common", configuration: "testRuntimeMigration")
   testImplementation library.java.junit
-  testImplementation "io.oden:embedded-redis:0.0.3"
+  testImplementation "org.signal:embedded-redis:0.8.2"
   testRuntimeOnly library.java.slf4j_jdk14
   testRuntimeOnly project(path: ":runners:direct-java", configuration: "shadow")
 }