windows builds fail to clone repository

[da1nerd]

I believe we are encountering the same issue as described in civetweb/civetweb#812

The clone fails with this error on the windows environment

##[error]fatal: filename in tree entry contains backslash: 'reports\report.html'

The problem seems to stem from changes in git 2.24.0. This is the version installed on the virtual environment.

See the following from the Git 2.25 Release Notes:

 * An earlier update to Git for Windows declared that a tree object is
   invalid if it has a path component with backslash in it, which was
   overly strict, which has been corrected.  The only protection the
   Windows users need is to prevent such path (or any path that their
   filesystem cannot check out) from entering the index.
   (merge 224c7d70fa js/mingw-loosen-overstrict-tree-entry-checks later to maint).

[da1nerd]

I've opened an issue to update the version of git installed on windows environments actions/runner-images#278

[da1nerd]

I've circumvented this problem by following the directions in actions/checkout#116 (comment).

This checks out the first commit which is faster and avoids the history that's breaking git.

[da1nerd]

Now we're getting the same error as in #6648

[da1nerd]

This was fixed in #6649

[PhotoNomad0]

Looking good