Downgrade pack.alpha

Appears that the build script would have to be upgraded. Since I'm in
the middle of releasing 0.19.0 I don't want to experiment on this
here, but rather downgrade it for the release

Author: mattiuusitalo

deps.edn

@@ -72,7 +72,7 @@
                       :main-opts  ["-m" "antq.core"]}
            :jar {:extra-deps {pack/pack.alpha
                               {:git/url "https://github.com/juxt/pack.alpha.git"
-                               :sha "04532ca003a575baaef94b39638801bb0a46f0f4"}}
+                               :sha "b093f79420fef019faf62a75b888b5e10f4e8cc9"}}
                  :main-opts ["-m" "mach.pack.alpha.skinny" "--no-libs"
                              "--project-path" "malli.jar"]}
            :deploy {:extra-deps {slipset/deps-deploy {:mvn/version "0.2.2"}}