Replace APT package cache action

[cknitt]

Summary

• replace awalsh128/cache-apt-pkgs-action with gerlero/apt-install
• keep recommended packages and upgrades disabled for predictable CI environments
• remove the obsolete Dependabot exclusion for the previous action

Why

The previous action transitively uses actions/cache@v4, which targets the deprecated Node.js 20 runtime. Newer releases of that action have repeatedly broken this repository's Dune setup. gerlero/apt-install@v1.3.12 caches downloaded Debian packages using actions/cache@v6 and installs them through dpkg.

Validation

• parsed the modified workflow and Dependabot YAML files
• ran git diff --cached --check
• verified the pinned action uses actions/cache/restore@v6 and actions/cache/save@v6

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commit: 389b08b

[github-actions]

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