Ninja 1.5.1

Closes #30698.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Remove .rb from boot2docker-cli alias

``boot2docker-cli`` (an alias for ``boot2docker``) was named
``boot2docker-cli.rb``, while all other aliases are named without the
``.rb`` ending. This commit simply renames the alias to follow the
pre-existing alias-naming convention.

Closes #30703.

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