update to prevent INJECT_FACTS_AS_VARS deprecation

[ghost]

---

name: update to prevent INJECT_FACTS_AS_VARS deprecation
about: INJECT_FACTS_AS_VARS deprecation

---

Describe the change

To fix the deprecation warning below. Usages were replaced accordingly.

TASK [robertdebock.bootstrap : Install bootstrap packages (package)] ***********
[WARNING]: Deprecation warnings can be disabled by setting `deprecation_warnings=False` in ansible.cfg.
[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: robertdebock.bootstrap/vars/main.yml:75:27
73
74 # Map the right set of packages, based on gathered ansible_facts.
75 bootstrap_facts_packages: "{{ _bootstrap_packages[ansible_distribution ~'_'~ ansible_distribution_major_version]|d...
                            ^ column 27
Use `ansible_facts["fact_name"]` (no `ansible_` prefix) instead.

Testing
N/A

[ghost]

The PR seems to be stall. Is there any chance to get this merged?