Fix: Using bucket path on windows and linux makes different cache files

[Banegasn]

if i use option awsBucket: "bucket-name/path-to-a-folder"

in windows will create

bucket-name
  "path-to-a-folder\hash.tgz"

and in linux `

bucket-name
   path-to-a-folder
      "hash.tgz"

making different caches for each of them

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[bojanbass]

Closing as https://github.com/bojanbass/nx-aws/pull/645 was merged.