release-21.2: util/log: fix redactability of logging tags

[cockroach-teamcity]

Exalate commented:

cockroachdb/cockroach#74155 --- Release note (cli change): A bug affecting the redactability of logging tags in output log entries has been fixed. This bug had been introduced in the v21.2 release.

Jira Issue: DOC-2222

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