Use 'master' constraints

This change sets the master branch to always pull from master
constraints and the snap's version is set to devel, so it can be
constantly published to latest/edge in the snap store

Change-Id: Ib8b2752035bbe2572e2eac5cc32581843bc904ae

snapcraft.yaml

@@ -1,5 +1,5 @@
 name: openstackclients
-version: "2024.1"
+version: "devel"
 summary: OpenStack Client tools
 description: |
   OpenStackClient (aka OSC) is a command-line client for OpenStack
@@ -49,12 +49,6 @@ apps:
     plugs:
       - network
       - home
-  nova:
-    command: bin/nova
-    plugs:
-      - network
-      - home
-      - ssh-public-keys
   cinder:
     command: bin/cinder
     plugs:
@@ -176,7 +170,7 @@ parts:
       - setuptools-rust
       - Cython
     python-constraints:
-      - https://raw.githubusercontent.com/openstack/requirements/stable/2024.1/upper-constraints.txt
+      - https://raw.githubusercontent.com/openstack/requirements/master/upper-constraints.txt
     build-packages:
       - libffi-dev
       - libkrb5-dev