program-wide lints from v21

See #3626, release log:

• ed82e2b by @yegor256: Merge pull request #3625 from ...
• 69bb9a1 by @maxonfjvipon: Merge branch 'fix/#3569/xsd-at...
• 6f0cc0a by @maxonfjvipon: fix(#3569): minor fixes
• 31b6b9c by @yegor256: Merge pull request #3627 from ...
• 07977d0 by @yegor256: #3626: lint always
• 3330ad9 by @yegor256: #3626: lint all
• e0a0746 by @yegor256: #3626: better logging
• 5efbcb6 by @yegor256: Merge pull request #3616 from ...
• 468a8b2 by @renovate[bot]: fix(deps): update dependency o...
• eddd175 by @maxonfjvipon: Merge branch 'master' into fix...
• d5ab000 by @maxonfjvipon: fix(#3569): prohibit numbers i...
• cd2e432 by @yegor256: tests fixed
• 79ab1b7 by @yegor256: comment
• 17dc231 by @yegor256: Merge pull request #3622 from ...
• 5a7e485 by @yegor256: simplified
• 88f99b3 by @yegor256: function-name in XSD
• 5049689 by @yegor256: extra test
• 60920ef by @yegor256: extra test
• 0292554 by @yegor256: extra tests
• 26361cd by @yegor256: extra tests
• and 55 more...

Released by Rultor 2.0-SNAPSHOT, see build log