Update yegor256/rultor-image Docker tag to v1.20.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
yegor256/rultor-image	final	minor	1.19.0 -> 1.20.0

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[yegor256]

@rultor please, try to merge

[rultor]

@rultor please, try to merge

@yegor256 Unfortunately, either you or me don't have 'write' permissions to the repository, I can't do what you're asking. Try to add me as a collaborator with 'write' access.