Exchange the link to downloads for a valid link

[pwalczysko]

As indicated by @jburel , the link to download Aspera desktop client is leading to a site with expired cert and the browser gives a warning.

This PR is exchanging the link for a valid one, with the same content.

cc @sbesson @francesw

built at https://snoopycrimecop.github.io/idr.openmicroscopy.org/download.html

[pwalczysko]

built at https://snoopycrimecop.github.io/idr.openmicroscopy.org/download.html

[pwalczysko]

@jburel Happy with the change here please ? The PR would be a good candidate for testing of https://github.com/IDR/deployment/pull/390 cc @sbesson

[jburel]

changes look good Thanks

[pwalczysko]

Thank you @jburel , maybe @sbesson can merge please, I have no right here.

[jburel]

@pwalczysko done