[skip-release] Update github-actions to df4cb1c

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout (changelog)	action	digest	de0fac2 → df4cb1c

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[github-actions]

Running State Persistence Stress Tests

Testing Small, Medium, Large, and XLarge scales...

Stress Test Summary

Scale	Entries	JSON Size	Time	Threshold	Status
Small	16 rate / 256 verified	16.08 KB	1ms	<500ms	✅
Medium	256 rate / 65K verified	3.90 MB	90ms	<1s	✅
Large	1K rate / 262K verified	15.59 MB	449ms	<3s	✅
XLarge	4K rate / 1M verified	62.74 MB	2137ms	<10s	✅

ℹ️ Performance metrics reported (thresholds informational only in CI)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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