[FIX] Fix apt-get installation errors in CI

[pranavrajpal]

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When running the CI for #540, the dependency installation failed when apt-get tried to install libvirt-dev, showing a message saying that it received a 404 error when trying to download packages (see https://github.com/CCExtractor/sample-platform/pull/540/checks?check_run_id=2542600517).

This appears to be related to actions/runner-images#2104, which suggests in actions/runner-images#2104 (comment) to try running apt-get update before installing anything.

Looking at the mirror that apt-get is trying to access, the problem it describes in that comment does appear to be what is happening here, as apt-get is trying to access deb files with ubuntu8.8 in them, but the mirror that it's connecting to has the same packages but with ubuntu8.9 in them instead.

[codecov]

Codecov Report

Merging #541 (ad240f8) into master (e5da5aa) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #541   +/-   ##
=======================================
  Coverage   80.94%   80.94%           
=======================================
  Files          36       36           
  Lines        3589     3589           
  Branches      408      408           
=======================================
  Hits         2905     2905           
  Misses        549      549           
  Partials      135      135           

Flag	Coverage Δ
unittests	80.94% <ø> (ø)

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