Update AZP config (#3111)

* Update AZP config.

* Skip 8.4 as well for django_manage (next to 8.3 and 8.2).

* Temporarily skip 8.4 for yum_versionlock.

.azure-pipelines/azure-pipelines.yml

@@ -186,8 +186,8 @@ stages:
               test: macos/11.1
             - name: RHEL 7.9
               test: rhel/7.9
-            - name: RHEL 8.3
-              test: rhel/8.3
+            - name: RHEL 8.4
+              test: rhel/8.4
             - name: FreeBSD 12.2
               test: freebsd/12.2
             - name: FreeBSD 13.0

tests/integration/targets/django_manage/aliases

@@ -5,3 +5,4 @@ skip/macos
 skip/osx
 skip/rhel8.2
 skip/rhel8.3
+skip/rhel8.4

tests/integration/targets/yum_versionlock/aliases

@@ -3,3 +3,4 @@ skip/aix
 skip/freebsd
 skip/osx
 skip/macos
+skip/rhel8.4  # TODO make sure that tests work on 8.4 as well!