Switch from pycryptodome to pycryptodomex

So for some weird historical reasons, the same python module is
available as pycryptodome (Crypto.* namespace) and pycryptodomex
(Cryptodome.* namespace).  See the following information on the project
homepage: https://www.pycryptodome.org/src/installation

To make things extra-weird, Debian choose to package pycryptodomex as
python3-pycryptodome
(https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=886291).

So in order to support both Debian-packaged and differently-installed
packages, let's switch to pycryotodomex on all platforms/installers.

Change-Id: I04daed01f51f9702595ef9f9e0d7fcdf1e4adb62
diff --git a/setup.py b/setup.py
index d14ebc6..d4fb15f 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
         "pyyaml >= 5.1",
         "termcolor",
         "colorlog",
-        "pycryptodome",
+        "pycryptodomex",
         "packaging",
     ],
     scripts=[