Update actions/checkout digest to eef6144

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	digest	692973e -> eef6144

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[github-actions]

✅ Test Seed Generated Successfully

To apply the test seed:

1. Desktop: Launch the browser with --variations-pr=1220.
   Android: Set the command line to --variations-pr=1220 in debug menu, restart the browser.
   iOS: Set Variations PR to 1220 in Brave Core Switches debug menu, restart the browser.
2. Wait 5-10 seconds to fetch the seed.
3. Restart the browser to apply the seed.
4. Ensure Active Variations section at brave://version starts with the expected seed version (see below).

Seed Details

Parameter	Value
Version	pull/1220@34f464e3d7aab6444555d953ea1f1160fc3b253f
Uploaded	Wed, 09 Oct 2024 00:58:50 GMT
PR commit	78edef3
Base commit	5288755
Merge commit	34f464e
Serial number	d9906afe6656a58415e83023388690c4