GitHub Actions CI: fix warnings of duplicate package installations

[maxkratz]

The warnings can be seen, e.g., here: https://github.com/eMoflon/emoflon-ibex-eclipse-build/actions/runs/14171114501

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[build-macos-arm-dev-hipe](https://github.com/eMoflon/emoflon-ibex-eclipse-build/actions/runs/14171114501/job/39750773559#step:3:17)
curl 8.12.1 is already installed and up-to-date. To reinstall 8.12.1, run: brew reinstall curl
[build-macos-arm-dev-hipe](https://github.com/eMoflon/emoflon-ibex-eclipse-build/actions/runs/14171114501/job/39750773559#step:3:13)
wget 1.25.0 is already installed and up-to-date. To reinstall 1.25.0, run: brew reinstall wget
[build-macos-arm-dev-hipe](https://github.com/eMoflon/emoflon-ibex-eclipse-build/actions/runs/14171114501/job/39750773559#step:3:9)
p7zip 17.06 is already installed and up-to-date. To reinstall 17.06, run: brew reinstall p7zip
[...]