Remove support of extra golang versions

[Lagovas]

We decided to support only last versions of golang due to prioritizing distribution via packages and docker images, decreasing demand of building from sources, and simplifying installation of the new golang versions. Additionally downgraded back boto3 due to missing that version on PYPI for python3 available on centos7.

Checklist

• [ ] Change is covered by automated tests
• [ ] The coding guidelines are followed
• [ ] Public API has proper documentation in the Acra documentation site or has PR on documentation repository with new changes
• [ ] CHANGELOG.md is updated (in case of notable or breaking changes)
• [ ] CHANGELOG_DEV.md is updated
• [ ] Benchmark results are attached (if applicable)
• are up-to-date (in case of API changes)