chore(deps): update actions/checkout digest to b4ffde6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	digest	8ade135 -> b4ffde6

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[github-actions]

Benchmark for 387a7c7

Click to view benchmark

Test	Base	PR	%
mysql/consume/1000	3.2±0.06s	3.3±0.04s	+3.12%
mysql/push/1000	1425.4±18.12ms	1499.3±19.73ms	+5.18%
postgres/consume/1000	876.7±40.82ms	858.7±35.05ms	-2.05%
postgres/push/1000	519.5±16.69ms	506.6±10.83ms	-2.48%
redis/consume/1000	552.0±0.35ms	551.7±0.46ms	-0.05%
redis/push/1000	139.6±3.85ms	136.3±3.42ms	-2.36%
sqlite_in_memory/consume/1000	1000.3±23.45ms	1000.1±23.33ms	-0.02%
sqlite_in_memory/push/1000	60.5±1.16ms	57.8±2.05ms	-4.46%