Release 6.0.0

Breaking changes

• Drop support for Node 12.x. Minimum supported version is 14.x
• Drop support for Yarn >= 2. It was never supported because it just doesn't work, but now Yarn
  version is enforced in engines entry in package.json

Chores

• Do not pack Yarn version, rely on corepack instead
• Enable corepack on CI
• Update dependency @babel/core to ^7.18.13 (#175)
• Update dependency @types/jest to ^28.1.8 (#174)
• Update dependency eslint to ^8.23.0 (#180)
• Update dependency eslint-plugin-jest to v27 (#183)
• Update dependency jest to v29 (#178)
• Update dependency release-it to ^15.4.0 (#176)
• Update dependency typescript to ^4.8.2 (#179)
• Update Yarn to v3.2.3 (#177)