tests: os: secureboot - make waiting for failed boot timer longer

[rcooke-warwick]

Change-type: patch

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Contributor checklist

• Changes have been tested
  • Covered in automated test suite
  • Manual test case recorded
• Change-type present on at least one commit
• Signed-off-by is present
• The PR complies with the Open Embedded Commit Patch Message Guidelines

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  • 'Approve' if this change would be acceptable in the codebase (even if there are minor or cosmetic tweaks that could be improved).
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[flowzone-app]

Website deployed to CF Pages, 👀 preview link https://face5bff.balena-os.pages.dev

[klutchell]

/rebase

[klutchell]

/deploy

[klutchell]

/rebase

[floion]

/rebase

[floion]

/deploy

[floion]

/rebase

[floion]

/rebase

[klutchell]

@rcooke-warwick should we consider this for merge?