Add change log fragment

changelogs/fragments/drop_ansible_core_2_12_and_2_13.yml

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+---
+
+major_changes:
+
+  - The community.mysql collection no longer supports ``ansible-core 2.12`` and
+    ``ansible-core 2.13``. While we take no active measures to prevent usage
+    and there are no plans to introduce incompatible code to the modules, we
+    will stop testing those versions. Both are or will soon be End of Life and
+    if you are still using them, you should consider upgrading to the
+    ``latest Ansible / ansible-core 2.15 or later`` as soon as possible
+    (https://github.com/ansible-collections/community.mysql/pull/574).