don't merge if rultor.yml is in the pull request

See #1459, release log:

• a5e6c7d by @rultor: Merge branch '__rultor'
• 499701b by @pnatashap: [#1459] Fix comments
• 3e9a104 by @pnatashap: [#1459] Fix todo
• e6da7c0 by @pnatashap: [#1459] Add test placeholder
• 1b61f44 by @renovate[bot]: fix(deps): update aws-java-sdk...
• b848de8 by @pnatashap: [#1459] Fix style errors

Released by Rultor 1.76.0, see build log