Fix: be sure to keep track the job context (#289)

Ensure proper tracking of potential updates to context data (e.g.: Attempts) by deleting the job with `hdel` before executing the `hsetnx `command, as it does not perform data updates.

packages/apalis-redis/lua/schedule_job.lua

@@ -7,6 +7,8 @@
 
 -- Returns: 1 if the job was newly scheduled, 0 if it already exists
 
+-- delete the job to keep track of context
+redis.call("HDEL", KEYS[1], ARGV[1])
 -- Set job data in hash
 local set = redis.call("hsetnx", KEYS[1], ARGV[1], ARGV[2])
 redis.call("zadd", KEYS[2], ARGV[3], ARGV[1])