trivial: less vector allocation

[msmouse]

Description

Type of Change

• New feature
• Bug fix
• Breaking change
• Performance improvement
• Refactoring
• Dependency update
• Documentation update
• Tests

Which Components or Systems Does This Change Impact?

• Validator Node
• Full Node (API, Indexer, etc.)
• Move/Aptos Virtual Machine
• Aptos Framework
• Aptos CLI/SDK
• Developer Infrastructure
• Other (specify)

How Has This Been Tested?

Key Areas to Review

Checklist

• I have read and followed the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I identified and added all stakeholders and component owners affected by this change as reviewers
• I tested both happy and unhappy path of the functionality
• I have made corresponding changes to the documentation

[trunk-io]

⏱️ 3h 30m total CI duration on this PR

Job	Cumulative Duration	Recent Runs
single-node-performance	1h 55m	🟥 🟥 🟥
rust-targeted-unit-tests	31m	⬜ 🟩 🟩
rust-lints	20m	⬜ 🟩 🟩
rust-move-tests	13m	🟩 🟩 🟩
run-tests-main-branch	12m	🟩 🟩 🟩
test-target-determinator	8m	🟩 🟩
general-lints	5m	🟩 🟩 🟩
check-dynamic-deps	3m	🟩 🟩 🟩
semgrep/ci	1m	🟩 🟩 🟩
file_change_determinator	29s	🟩 🟩 🟩
file_change_determinator	29s	🟩 🟩 🟩
permission-check	9s	🟩 🟩 🟩
permission-check	9s	🟩 🟩 🟩
permission-check	7s	🟩 🟩 🟩
permission-check	7s	🟩 🟩 🟩

🚨 2 jobs on the last run were significantly faster/slower than expected

Job	Duration	vs 7d avg	Delta
rust-lints	10m	7m
rust-move-tests	7m	12m

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