Switch from github to git source in nvchecker.toml

.nvchecker.toml

 [prrte]
-source = "github"
-github = "openpmix/prrte"
-use_max_tag = true
+source = "git"
+git = "https://github.com/openpmix/prrte"
+prefix = "v"
 exclude_regex = ".*(pre|rc|alpha|beta).*"