scsh: add HEAD

Closes #19071.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
jenkins 1.510

Closes #19072.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
dart 21094

Closes #19073.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
ezlupdate: update download URL

Closes #19075.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>