Fix deprecation

[C0rn3j]

[DEPRECATION WARNING]: INJECT_FACTS_AS_VARS default to `True` is deprecated, top-level facts will not be auto injected after the change. This feature will be removed from ansible-core version 2.24.
Origin: /root/.ansible/roles/gantsign.visual-studio-code-extensions/tasks/main.yml:10:7

 8 - name: Include package manager specific vars
 9   with_first_found:
10     - '../vars/pkg-mgr/{{ ansible_pkg_mgr }}.yml'
         ^ column 7

Use `ansible_facts["fact_name"]` (no `ansible_` prefix) instead.