Updates for testing period for 23.10 release

* charm-helpers sync for classic charms
* build.lock file for reactive charms
* ensure tox.ini is from release-tools
* Locked requirements using pip-compile:
  * existing (test-)requirements.txt ->
    (test-)requirements.in
  * pip-compile to *-py3[8|10].txt using python3.8
    and python3.10.
  * Updated tox.ini to use the appropriate merged
    requirements-*.txt files.
* Removal of lunar from metadata, charmcraft.yaml
  osci.yaml, tests.yaml and associated bundles.
* Locked libs and tests to stable/bobcat branches for:
  * charm-helpers
  * charms.openstack
  * zaza
  * zaza-openstack-tests

Change-Id: Ib764c26ce162789ef194e79002e35c7ed42aa39a

.gitreview

@@ -2,3 +2,5 @@
 host=review.opendev.org
 port=29418
 project=openstack/charm-swift-proxy.git
+
+defaultbranch=stable/2023.2

charm-helpers-hooks.yaml

@@ -1,4 +1,4 @@
-repo: https://github.com/juju/charm-helpers
+repo: https://github.com/juju/charm-helpers@stable/bobcat
 destination: charmhelpers
 include:
     - core

charmcraft.yaml

@@ -32,9 +32,6 @@ bases:
       - name: ubuntu
         channel: "22.04"
         architectures: [amd64, s390x, ppc64el, arm64]
-      - name: ubuntu
-        channel: "23.04"
-        architectures: [amd64, s390x, ppc64el, arm64]
       - name: ubuntu
         channel: "23.10"
         architectures: [amd64, s390x, ppc64el, arm64]

charmhelpers/contrib/openstack/utils.py

@@ -585,7 +585,6 @@ def _do_install():
     return openstack_release().get('OPENSTACK_CODENAME')
 
 
-@cached
 def openstack_release():
     """Return /etc/os-release in a dict."""
     d = {}