New PHPStan release, new issue with the ignores.

Fixed now in a way that should be more stable.

PHPStan: fix ignores

Composer checks have started to run into trouble with the minimum PHP version vs the YoastCS dependency (which has a higher minimum PHP version).

As Dependabot has never made a useful contribution for the Composer dependencies anyway AND there are only a few, we may as well drop it to get rid of the incessant error notifications.

Ref: https://github.com/Yoast/PHPUnit-Polyfills/network/updates/958266171

Dependabot: remove Composer ecosystem

If a tool version is specified, workflows can run into rate limiting issues with the GitHub API. To get round this, the `GITHUB_TOKEN` needs to be provided.

The `tools` key is also used in the CS workflows, but has, so far, not yielded any problematic builds for those. If needs be, the same tweak can be made to those job steps if those jobs would start to hit rate limits in the future.

Ref: https://github.com/shivammathur/setup-php#wrench-tools-support

…t-issues

GH Actions/test: fix rate limiting issue

The README for the 4.x version will be updated to reflect the features supported in the 4.x series.

This commit updates the README section about which versions of PHPUnit will be supported by which versions of the PHPUnit Polyfills.

As of now, the `main` branch, will be the release branch for PHPUnit Polyfills 4.x.

Includes minor textual tweaks to the release checklist.

1.x | Minor updates for 4.x branch

Follow up on 244.

This adds the `GITHUB_TOKEN` to get round the rate limiting where necessary.

It also adds `fail-fast` to get `setup-php` to exit with a non-zero exit code if something required in `tools` could not be installed (or other customizations failed).
This prevents running unnecessary interim steps if a later step would never be able to succeed anyway.

…miting

GH Actions: prevent more rate limiting issues

Includes updating the `VERSION` constant in the `Autoload` class.

Changelog for the 1.1.4 release