Alter default cache

defaults

@@ -2,7 +2,7 @@
   "vep_docker": "registry.cn-shanghai.aliyuncs.com/pgx-docker-registry/vep:v104.0",
   "fasta": "GRCh38.d1.vd1.fa",
   "ref_dir": "oss://pgx-reference-data/GRCh38.d1.vd1/",
-  "cache": "oss://pgx-reference-data/ensembl_vep/cache/",
+  "cache": "oss://pgx-reference-data/ensembl_vep/",
   "vep_path": "/opt/vep/ensembl-vep",
   "species": "homo_sapiens_merged",
   "ncbi_build": "GRCh38",