use centos stream 8 box from cloud.centos.org

[evgeni]

the one on vagrant cloud is old and outdated

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (651844d) 0.66% compared to head (bce5e4b) 0.66%.

❗ Current head bce5e4b differs from pull request most recent head 0e46769. Consider uploading reports for the commit 0e46769 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #303      +/-   ##
=========================================
- Coverage    0.66%   0.66%   -0.01%     
=========================================
  Files          15      15              
  Lines        1945    1946       +1     
=========================================
  Hits           13      13              
- Misses       1932    1933       +1     

Impacted Files	Coverage Δ
lib/beaker-hostgenerator/data.rb	0.00% <0.00%> (ø)

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[ekohl]

I considered doing this when I did the same for C9 but ended up not doing it. Probably too busy with getting C9 to just work in the first place.