Make ssh commands used in the git smart transport compatible with libgit2 (#852)

[github-actions[bot]]

• Fix ssh commands used in go SmartSubtransport

Before the fix, the commands sent were of the form:

git-upload-pack "/bar/test-reponame"

This resulted in the git server returning error: error parsing command: invalid git command

This change replaces the double quotes with single quotes:

git-upload-pack '/bar/test-reponame'

• Update ssh.go

Co-authored-by: lhchavez lhchavez@lhchavez.com (cherry picked from commit 6cea7a7a59f44e0e72ca577fbea65a042b3fb26b)