Refresh for 2023.2 release

Summary of changes:
- Use core22 as a base to use python 3.10, otherwise incompatibilities
  issues are rised
- Update snap version and branch for upper constraints
- Update .gitreview defaultbranch

Change-Id: I6d8925edf431f5d4ccaba501eb3674e4660fdb3e

.gitreview

@@ -2,3 +2,4 @@
 host=review.opendev.org
 port=29418
 project=x/snap-openstackclients.git
+defaultbranch=stable/2023.2

snapcraft.yaml

@@ -1,5 +1,5 @@
 name: openstackclients
-version: "2024.1"
+version: "2023.2"
 summary: OpenStack Client tools
 description: |
   OpenStackClient (aka OSC) is a command-line client for OpenStack
@@ -14,7 +14,7 @@ description: |
   project specific command-line clients.
 confinement: strict
 grade: stable
-base: core24
+base: core22
 environment:
   REQUESTS_CA_BUNDLE: /etc/ssl/certs/ca-certificates.crt
   PYTHONIOENCODING: utf-8
@@ -176,7 +176,7 @@ parts:
       - setuptools-rust
       - Cython
     python-constraints:
-      - https://raw.githubusercontent.com/openstack/requirements/stable/2024.1/upper-constraints.txt
+      - https://raw.githubusercontent.com/openstack/requirements/stable/2023.2/upper-constraints.txt
     build-packages:
       - libffi-dev
       - libkrb5-dev