Update to core22 base

Misc refresh of snapcraft fields to align with requirements
for core22.

Change-Id: I5dcba7320b2ff2bf04e52542e1c1f426fa64afdc

snapcraft.yaml

@@ -14,7 +14,7 @@ description: |
   project specific command-line clients.
 confinement: strict
 grade: stable
-base: core20
+base: core22
 environment:
   REQUESTS_CA_BUNDLE: /etc/ssl/certs/ca-certificates.crt
   PYTHONIOENCODING: utf-8
@@ -144,6 +144,7 @@ apps:
 parts:
   openstackclients:
     plugin: python
+    source: .
     python-packages:
       - aodhclient
       - osc-placement
@@ -178,7 +179,7 @@ parts:
       - toml
       - setuptools-rust
       - Cython
-    constraints:
+    python-constraints:
       - https://raw.githubusercontent.com/openstack/requirements/stable/zed/upper-constraints.txt
     build-packages:
       - libffi-dev
@@ -191,7 +192,7 @@ parts:
       - rustc
       - cargo
     override-prime: |
-      snapcraftctl prime
+      craftctl default
       # This is the last step, let's now compile all our pyc files.
       ./bin/python3 -m compileall .
       # Generate completer script snippets