build: bump version to 4.0.0-RC6 and publish nats/redis/web modules

publish.sh was only pushing rqueue-core, rqueue-spring, and
rqueue-spring-boot-starter to Maven Central; rqueue-nats, rqueue-redis,
and rqueue-web were never published, so downstream consumers couldn't
pull the new backends/explorer module. Added them to the publish
script and bumped the subprojects version from 4.0.0-RC4 to 4.0.0-RC6
for the next release.

Author: sonus21

build.gradle

@@ -85,7 +85,7 @@ ext {
 
 subprojects {
     group = "com.github.sonus21"
-    version = "4.0.0-RC4"
+    version = "4.0.0-RC6"
 
     dependencies {
         // https://mvnrepository.com/artifact/org.springframework/spring-messaging

publish.sh

@@ -16,5 +16,8 @@
 #
 
 ./gradlew rqueue-core:publishToMavenCentral
+./gradlew rqueue-nats:publishToMavenCentral
+./gradlew rqueue-redis:publishToMavenCentral
+./gradlew rqueue-web:publishToMavenCentral
 ./gradlew rqueue-spring:publishToMavenCentral
 ./gradlew rqueue-spring-boot-starter:publishToMavenCentral