feat: add support for ssh-sk to nova

Support for `ssh-sk` keys was recently added in the cryptography package pyca/cryptography#10608. By installing version `43.0.0` we can benefit from such support within `Nova`

Author: jackhodgkiss

etc/kayobe/kolla.yml

@@ -346,6 +346,11 @@ kolla_build_blocks:
     {% set magnum_capi_packages = ['magnum-capi-helm==1.1.0'] %}
     RUN {{ macros.install_pip(magnum_capi_packages | customizable("pip_packages")) }}
     {% endraw %}
+  nova_base_footer: |
+    {% raw %}
+    {% set nova_packages = ['cryptography==43.0.0'] %}
+    RUN {{ macros.install_pip(nova_packages | customizable("pip_packages")) }}
+    {% endraw %}
 
 # Dict mapping image customization variable names to their values.
 # Each variable takes the form: