chore: drop the copyright year from the license files

[emmenko]

The copyright year is strictly not required. Keeping the year up to date is also annoying, so it's fine to drop it.

Other open source projects have done the same, for example React: facebook/react#13593.

Alternative would be to use a format like 2017-present.

[changeset-bot]

🦋 Changeset detected

Latest commit: 364e5e7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 30 packages

Name	Type
@commercetools-backend/eslint-config-node	Patch
@commercetools-backend/express	Patch
@commercetools-backend/loggers	Patch
@commercetools-frontend/actions-global	Patch
@commercetools-frontend/application-config	Patch
@commercetools-frontend/application-shell	Patch
@commercetools-frontend/application-shell-connectors	Patch
@commercetools-frontend/assets	Patch
@commercetools-frontend/babel-preset-mc-app	Patch
@commercetools-frontend/browser-history	Patch
@commercetools-frontend/constants	Patch
@commercetools-frontend/create-mc-app	Patch
@commercetools-frontend/eslint-config-mc-app	Patch
@commercetools-frontend/i18n	Patch
@commercetools-frontend/jest-preset-mc-app	Patch
@commercetools-frontend/l10n	Patch
@commercetools-frontend/mc-html-template	Patch
@commercetools-frontend/mc-scripts	Patch
@commercetools-frontend/notifications	Patch
@commercetools-frontend/permissions	Patch
@commercetools-frontend/react-notifications	Patch
@commercetools-frontend/sdk	Patch
@commercetools-frontend/sentry	Patch
@commercetools-frontend/url-utils	Patch
playground	Patch
merchant-center-application-template-starter	Patch
@commercetools-frontend/cypress	Patch
@commercetools-frontend/application-components	Patch
@commercetools-local/visual-testing-app	Patch
@commercetools-website/components-playground	Patch

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