chore: remove unused import

[federico-stacks]

Description

Remove an unused import left over from #7220.

Applicable issues

• fixes #

Additional info (benefits, drawbacks, caveats)

Checklist

• Test coverage for new or modified code paths
• For new Clarity features or consensus changes, add property tests (see docs/property-testing.md)
• Changelog fragment(s) or "no changelog" label added (see changelog.d/README.md)
• Required documentation changes (e.g., rpc/openapi.yaml for RPC endpoints, event-dispatcher.md for new events)
• New clarity functions have corresponding PR in clarity-benchmarking repo

[coveralls]

Coverage Report for CI Build 26633337869

Coverage increased (+0.04%) to 85.755%

Details

• Coverage increased (+0.04%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 6673 coverage regressions across 119 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

6673 previously-covered lines in 119 files lost coverage.

Top 10 Files by Coverage Loss	Lines Losing Coverage	Coverage
stackslib/src/config/mod.rs	376	68.96%
stackslib/src/net/mod.rs	310	77.91%
stackslib/src/chainstate/stacks/index/storage.rs	284	82.27%
stackslib/src/chainstate/stacks/miner.rs	259	83.06%
clarity/src/vm/database/clarity_db.rs	244	82.23%
stackslib/src/chainstate/stacks/db/transactions.rs	222	97.16%
stackslib/src/net/inv/epoch2x.rs	212	80.01%
stackslib/src/net/chat.rs	201	93.01%
stackslib/src/chainstate/stacks/db/mod.rs	196	86.23%
stackslib/src/core/mempool.rs	193	86.44%

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Coverage Stats

Relevant Lines:	223466
Covered Lines:	191633
Line Coverage:	85.75%
Coverage Strength:	19169506.47 hits per line

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💛 - Coveralls