[stable-8] CI: Use community.crypto 2.x.y for ansible-core 2.16 and before (#10086) (#10090)

CI: Use community.crypto 2.x.y for ansible-core 2.16 and before (#10086)

* Use community.crypto 2.x.y for ansible-core 2.16 and before.

* Also use stable-2 for ubuntu2004 tests.

(cherry picked from commit 60f1169d42)

.github/workflows/ansible-test.yml

@@ -212,6 +212,7 @@ jobs:
           integration-continue-on-error: 'false'
           integration-diff: 'false'
           integration-retry-on-error: 'true'
+          # TODO: remove "--branch stable-2" from community.crypto install once we're only using ansible-core 2.17 or newer!
           pre-test-cmd: >-
             mkdir -p ../../ansible
             ;