Add changelog fragment for deprecated imports fix

Added changelog entry documenting the bugfixes for synchronize
and mount modules' deprecated import issues.

Related to #686

Co-authored-by: Cursor AI
Signed-off-by: Pavel Bar <pbar@redhat.com>

Author: barpavel

changelogs/fragments/686_fix_deprecated_imports.yml

@@ -0,0 +1,4 @@
+---
+bugfixes:
+  - synchronize - fix deprecated ``ansible.module_utils._text`` and ``ansible.module_utils.common._collections_compat`` imports (https://github.com/ansible-collections/ansible.posix/issues/686).
+  - mount - fix deprecated ``ansible.module_utils._text`` import (https://github.com/ansible-collections/ansible.posix/issues/686).