Upgrade Node.js and dependencies

[yhatt]

Notable changes

• Bumped Node.js to 18.14.1.
  • https://nodejs.org/en/blog/vulnerability/february-2023-security-releases/
• Updated some broken Jest tests.
  • jest.restoreAllMocks() seems to restore also other kind of mocks than jest.spyOn(). (e.g. the custom factory defined in jest.mock(): It was assumed to globally mock and not restore by jest.restoreAllMocks()).
• Bumped old GitHub Actions.