Logs: Severity Text string does not match the spec

[matejscerba]

Describe your environment

macOS Tahoe 26.3.1
Python 3.13.7

What happened?

Same as in #3548, but for logger.critical (CRITICAL severity text instead of FATAL as is described in documentation)

Steps to Reproduce

Same as in #3548, but replace logger.warn with logger.critical.

Expected Result

Severity Text = FATAL as defined in the spec.

Actual Result

Severity Text = CRITICAL

Additional context

No response

Would you like to implement a fix?

None

Tip

_{React with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding +1 or me too, to help us triage it. Learn more here.}

[themavik]

Fix submitted in #4999.