Incrementing VERSION to 74.0.3729.12

TBR=benmason@chromium.org

Change-Id: I382182fba22c6e08f32dd57fba2d641af3945254
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1521802
Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/branch-heads/3729@{#108}
Cr-Branched-From: d4a8972e30b604f090aeda5dfff68386ae656267-refs/heads/master@{#638880}
1 file changed