Remove support for py38 and enable py312 testing

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -50,7 +50,7 @@ body:
   attributes:
     label: Python Interpreter version
     description: The version(s) of Python used.
-    placeholder: "3.8"
+    placeholder: "3.9"
   validations:
     required: true
 - type: checkboxes

.github/workflows/jira_cloud_ci.yml

@@ -23,7 +23,7 @@ jobs:
         os: [ubuntu-latest]
         # We only test a single version to prevent concurrent
         # running of tests influencing one another
-        python-version: ["3.8"]
+        python-version: ["3.9"]
 
     steps:
       - uses: actions/checkout@v4
@@ -41,7 +41,7 @@ jobs:
           python -m pip install --upgrade tox tox-gh-actions
 
       - name: Test with tox
-        run: tox -e py38 -- -m allow_on_cloud
+        run: tox -e py39 -- -m allow_on_cloud
         env:
           CI_JIRA_TYPE: CLOUD
           CI_JIRA_CLOUD_ADMIN: ${{ secrets.CLOUD_ADMIN }}

.github/workflows/jira_server_ci.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.9", "3.10", "3.11"]
         jira-version: [8.17.1]
 
     steps:

.github/workflows/release.yml

@@ -17,10 +17,10 @@ jobs:
       TOX_PARALLEL_NO_SPINNER: 1
 
     steps:
-    - name: Switch to using Python 3.8 by default
+    - name: Switch to using Python 3.9 by default
       uses: actions/setup-python@v5
       with:
-        python-version: 3.8
+        python-version: 3.9
 
     - name: Install build dependencies
       run: python3 -m pip install --user tox

.github/workflows/tox.yml

@@ -34,7 +34,7 @@ jobs:
             pkg
           # ^ arm64 runner is using py311 for matching python version used in AAP 2.5
           platforms: linux,macos,linux-arm64:ubuntu-24.04-arm64-2core
-          skip_explode: "1"
+          # skip_explode: "1"
   build:
     name: ${{ matrix.name }}
     runs-on: ${{ matrix.os || 'ubuntu-24.04' }}