Remove apt-get update when unnecessary

[ia0]

This only saves 10 seconds and doesn't really prove that apt-get update is unnecessary since after dpkg --add-architecture i386 we still run it. But at least we run it one time less.

[gemini-code-assist]

Code Review

This pull request removes the sudo apt-get update command from the ci-checks workflow. While the goal of reducing unnecessary steps is good, this change could introduce instability into the CI pipeline. The subsequent setup.sh script installs packages using apt, which relies on up-to-date package lists. I've left a comment explaining the potential issue and recommending to keep the apt-get update step for now to ensure build reliability.

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.github/actions/ci-checks/action.yml (16-17)

Removing sudo apt-get update here is likely to cause intermittent CI failures. The next step runs ./scripts/setup.sh, which appears to install packages using apt (e.g., ensure apt gcc-multilib and ensure apt libssl-dev:i386 in scripts/setup.sh). Without updating the package lists, apt-get install may fail if the required packages are not in the runner's cache.

Given that the build is not yet fully hermetic and uses floating versions as mentioned in the PR description, it's safer to keep apt-get update to ensure build stability.