Add support for binaries in nested folder of archive

[mdedetrich]

From looking at the source code it appears that this github action doesn't support binaries that happen to be contained in nested folders, i.e. I am trying to use setup-bin to solve rupa/z#103 (comment) and when you extract mktemp-1.6-bin.zip you can see that the binary is location in the bin folder rather than in the root zip folder.

If binaries are actually supported within a nested folder (i.e. name: bin/mktemp.exe with the previous example) then a test should be added to confirm this.

[mdedetrich]

Closing issue, was a red herring