Upgrade to Go 1.20

[adamantike]

With the release of Go 1.20, version 1.18 is not supported anymore. This change upgrades the project to Go 1.20.

[codecov-commenter]

Codecov Report

Merging #446 (733b49c) into master (0febe3f) will decrease coverage by 0.47%.
The diff coverage is 2.94%.

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@@            Coverage Diff             @@
##           master     #446      +/-   ##
==========================================
- Coverage   32.54%   32.08%   -0.47%     
==========================================
  Files          54       54              
  Lines        3045     3067      +22     
  Branches       66       66              
==========================================
- Hits          991      984       -7     
- Misses       2018     2047      +29     
  Partials       36       36              

Flag	Coverage Δ
unittests	32.08% <2.94%> (-0.47%)	⬇️

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Impacted Files	Coverage Δ
webapp/backend/pkg/config/config.go	0.00% <0.00%> (ø)
webapp/backend/pkg/database/scrutiny_repository.go	11.65% <0.00%> (-0.96%)	⬇️
webapp/backend/pkg/web/server.go	62.26% <100.00%> (-4.41%)	⬇️

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[AnalogJ]

thanks for the PR @adamantike 🥳