test: execute dmesg task as privileged user

[mcattamoredhat]

This pull request includes:

We have seen edge-commit-f39 and edge-installer-f39 failing in CI due to "dmesg: read kernel buffer failed: Operation not permitted"

TASK [check dmesg output] ******************************************************
fatal: [192.168.100.50]: FAILED! => {"changed": true, "cmd": ["dmesg"], "delta": "0:00:00.004286", "end": "2024-04-19 15:07:24.268256", "msg": "non-zero return code", "rc": 1, "start": "2024-04-19 15:07:24.263970", "stderr": "dmesg: read kernel buffer failed: Operation not permitted", "stderr_lines": ["dmesg: read kernel buffer failed: Operation not permitted"], "stdout": "", "stdout_lines": []}

This PR suggests to execute dmesg playbook task as privileged user.

• adequate testing for the new functionality or fixed issue
• adequate documentation informing people about the change such as
  • submit a PR for the READMEs listed here
  • submit a PR for the osbuild.org website repository if this PR changed any behavior not covered by the automatically updated READMEs

[github-actions]

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