test: support ansible-core 2.20 (#714)

##### SUMMARY

Run test against ansible-core 2.20.


https://forum.ansible.com/t/ansible-core-devel-and-milestone-bumped-to-2-21-0-dev0/44684

.azure-pipelines/azure-pipelines.yml

@@ -47,6 +47,16 @@ stages:
             - name: Sanity
               test: devel/sanity
 
+  - stage: Sanity_2_20
+    displayName: Sanity 2.20
+    dependsOn: []
+    jobs:
+      - template: templates/matrix.yml
+        parameters:
+          targets:
+            - name: Sanity
+              test: 2.20/sanity
+
   - stage: Sanity_2_19
     displayName: Sanity 2.19
     dependsOn: []
@@ -75,8 +85,18 @@ stages:
       - template: templates/matrix.yml
         parameters:
           targets:
-            - name: (py3.13)
-              test: devel/units/3.13
+            - name: (py3.14)
+              test: devel/units/3.14
+
+  - stage: Units_2_20
+    displayName: Units 2.20
+    dependsOn: []
+    jobs:
+      - template: templates/matrix.yml
+        parameters:
+          targets:
+            - name: (py3.12)
+              test: 2.20/units/3.12
 
   - stage: Units_2_19
     displayName: Units 2.19
@@ -107,8 +127,19 @@ stages:
         parameters:
           groups: [1, 2, 3]
           targets:
-            - name: (py3.13)
-              test: devel/integration/3.13
+            - name: (py3.14)
+              test: devel/integration/3.14
+
+  - stage: Integration_2_20
+    displayName: Integration 2.20
+    dependsOn: []
+    jobs:
+      - template: templates/matrix.yml
+        parameters:
+          groups: [1, 2, 3]
+          targets:
+            - name: (py3.12)
+              test: 2.20/integration/3.12
 
   - stage: Integration_2_19
     displayName: Integration 2.19
@@ -137,12 +168,15 @@ stages:
     condition: succeededOrFailed()
     dependsOn:
       - Sanity_devel
+      - Sanity_2_20
       - Sanity_2_19
       - Sanity_2_18
       - Units_devel
+      - Units_2_20
       - Units_2_19
       - Units_2_18
       - Integration_devel
+      - Integration_2_20
       - Integration_2_19
       - Integration_2_18
     jobs: