chore: use --clean in deno test (#176)

deno.json

@@ -12,7 +12,7 @@
   },
   "tasks": {
     "redis:start": "redis-server --save \"\" --appendonly no --daemonize yes",
-    "test": "deno test --allow-net --trace-leaks --coverage --doc --parallel",
+    "test": "deno test --allow-net --trace-leaks --coverage --doc --parallel --clean",
     "test:dev": "deno task redis:start && deno task test || redis-cli SHUTDOWN",
     "bench": "deno bench --allow-net --allow-env",
     "bench:dev": "deno task redis:start && deno task bench",