fix: add expiration for threshold condition

[joemonem]

Motivation

Issue #1008

Implementation

• Added expiration to threshold condtion

Testing

Unit test

Version Changes

• timelock: 2.1.1-b.7 -> 2.1.1-b.8

Checklist

• Versions bumped correctly and documented
• Changelog entry added or label applied

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/timelock-threshold

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