pythongh-109408: Azure Pipelines: test 3.12 branch (pythonGH-109453)

(cherry picked from commit dd5d214)

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

Author: hugovk

.azure-pipelines/ci.yml

@@ -1,4 +1,4 @@
-trigger: ['main', '3.11', '3.10', '3.9', '3.8', '3.7']
+trigger: ['main', '3.12', '3.11', '3.10', '3.9', '3.8', '3.7']
 
 jobs:
 - job: Prebuild

.azure-pipelines/pr.yml

@@ -1,4 +1,4 @@
-pr: ['main', '3.11', '3.10', '3.9', '3.8', '3.7']
+pr: ['main', '3.12', '3.11', '3.10', '3.9', '3.8', '3.7']
 
 jobs:
 - job: Prebuild