Nightly build failed to clone ITK

[tbirdso]

CDash error shows failure to clone ITK with git protocol:

Cloning into 'ITK'... fatal: remote error:    The unauthenticated git protocol on port 9418 is no longer supported. Please see https://github.blog/2021-09-01-improving-git-protocol-security-github/ for more information. Cloning into 'ITK'... fatal: remote error:    The unauthenticated git protocol on port 9418 is no longer supported. Please see https://github.blog/2021-09-01-improving-git-protocol-security-github/ for more information. -- Had to git clone more than once:           3 times.
--
CMake Error at ITK-prefix/tmp/ITK-gitclone.cmake:66 (message):
  Failed to clone repository:
  'git://github.com/InsightSoftwareConsortium/ITK.git'


ninja: build stopped: subcommand failed.

Similar to InsightSoftwareConsortium/ITKSphinxExamples#328

[dzenanz]

I think we need to set default protocol to https instead of git somewhere.

[tbirdso]

Agreed, I am testing a resolution in ITKSphinxExamples and will also add here when verified.