Update dependency ansible-core to v2.21.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
ansible-core	==2.18.10 → ==2.21.3

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[timherrm]

AVD 5.7.2 does not support Ansible 2.19/2.20

cat /home/ciuser/.ansible/collections/ansible_collections/arista/avd/meta/runtime.yml
---
requires_ansible: '>=2.16.0,<2.19.0'

[timherrm]

Base Image is still debian 12 with python 3.11--
ERROR: Ignored the following versions that require a different python version: 2.20.0 Requires-Python >=3.12
DONE

[timherrm]

With AVD 6.0.1 newer ansible versions are supported.

cat /home/ciuser/.ansible/collections/ansible_collections/arista/avd/meta/runtime.yml
---
requires_ansible: '>=2.16.0,<2.21.0'