Deprecate Ansible 6

Ansible 6 is no longer supported and 8 is available and working.
Deprecate Ansible 6.

Change-Id: I721ae1659cc062d9938ceea863ad746996892cc7

releasenotes/notes/deprecate-ansible-6-ce96fc1d7ff9e733.yaml

@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Ansible versions 6 is now deprecated in Zuul since it is
+    unmaintaned, and it will be removed from a future version of Zuul.
+    Ansible 8 is now the default version in Zuul.

tests/fixtures/config/ansible-versions/git/common-config/zuul.yaml

@@ -25,7 +25,7 @@
     parent: ansible-version
     vars:
       test_ansible_version_major: 2
-      test_ansible_version_minor: 13
+      test_ansible_version_minor: 15
 
 # This job is used by a test case specifying a different ansible version in
 # fixtures/zuul-default-ansible-version.conf
@@ -37,7 +37,7 @@
     parent: ansible-version
     vars:
       test_ansible_version_major: 2
-      test_ansible_version_minor: 15
+      test_ansible_version_minor: 13
 
 - job:
     name: ansible-6

tests/fixtures/zuul-default-ansible-version.conf

@@ -7,7 +7,7 @@ server=127.0.0.1
 tenant_config=main.yaml
 relative_priority=true
 # Used by ansible-default-zuul-conf job
-default_ansible_version=8
+default_ansible_version=6
 
 [merger]
 git_dir=/tmp/zuul-test/merger-git

tests/unit/test_web.py

@@ -1169,7 +1169,7 @@ class TestWeb(BaseTestWeb):
         job_params = {
             'job': 'project-test1',
             'ansible_split_streams': None,
-            'ansible_version': '6',
+            'ansible_version': '8',
             'timeout': None,
             'post_timeout': None,
             'items': [],
@@ -1271,7 +1271,7 @@ class TestWeb(BaseTestWeb):
 
         job_params = {
             'ansible_split_streams': None,
-            'ansible_version': '6',
+            'ansible_version': '8',
             'branch': 'master',
             'extra_vars': {},
             'group_vars': {},

zuul/lib/ansible-config.conf

@@ -1,11 +1,12 @@
 # This file describes the currently supported ansible versions
 [common]
-default_version = 6
+default_version = 8
 # OpenStackSDK 0.99.0 coincides with CORS header problems in some providers
 requirements = openstacksdk<0.99 openshift jmespath google-cloud-storage pywinrm boto3 azure-storage-blob ibm-cos-sdk netaddr passlib google-re2
 
 [6]
 requirements = ansible>=6.0,<7.0
+deprecated = true
 
 [8]
 requirements = ansible>=8.0,<9.0