Bump version to 2.0.4

[maciaszczykm]

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[k8s-ci-robot]

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[codecov]

Codecov Report

Merging #5498 into master will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5498      +/-   ##
==========================================
- Coverage   45.26%   45.25%   -0.01%     
==========================================
  Files         214      214              
  Lines       10261    10261              
  Branches      111      111              
==========================================
- Hits         4645     4644       -1     
- Misses       5345     5346       +1     
  Partials      271      271              

Impacted Files	Coverage Δ
...p/backend/integration/metric/common/aggregation.go	89.09% <0.00%> (-1.82%)	⬇️

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