Merging to release-5-lts: [TT-9401/TT-9400/TT-9441] Fix reported CVEs on dockerhub (#5310) #5324
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[TT-9401/TT-9400/TT-9441] Fix reported CVEs on dockerhub (#5310)
Related issues: https://tyktech.atlassian.net/browse/TT-9401,
https://tyktech.atlassian.net/browse/TT-9400,
https://tyktech.atlassian.net/browse/TT-9441
Remove ruby-dev added in golang cross
https://github.com/TykTechnologies/golang-cross/blob/master/Dockerfile#L48
Remove python3 preinstalled in debian - plugin compiler doesn't require
it.