Update composer/composer requirement from ^1.4 to ^1.4 || ^2.0

[dependabot-preview]

Updates the requirements on composer/composer to permit the latest version.

Release notes

Sourced from composer/composer's releases.

2.0.1

• Fixed crash on PHP8

Changelog

Sourced from composer/composer's changelog.

[2.0.1] 2020-10-24

• Fixed crash on PHP8

[2.0.0] 2020-10-24

• Fixed proxy handling issues when combined with our new curl-based downloader
• Fixed solver bug resulting in endless loops in some cases
• Fixed solver output being extremely long due to learnt rules
• Fixed solver bug with multi literals
• Fixed a couple minor regressions

[2.0.0-RC2] 2020-10-14

• Breaking: Removed OperationInterface::getReason as the data was not accurate
• Added automatic removal of packages which are not required anymore whenever an update is done, this will purge packages previously left over by partial updates and require/remove
• Added shorthand aliases -w for --with-dependencies and -W for --with-all-dependencies on update/require/remove commands
• Added COMPOSER_DEBUG_EVENTS=1 env var support for plugin authors to figure out which events are triggered when
• Added setCustomCacheKey to PreFileDownloadEvent and fixed a cache bug for integrations changing the processed url of package archives
• Added Composer\Util\SyncHelper for plugin authors to deal with async Promises more easily
• Added $composer->getLoop()->getHttpDownloader() to get access to the main HttpDownloader instance in plugins
• Added a non-zero exit code (2) and warning to remove command when a package to be removed could not be removed
• Added --apcu-autoloader-prefix (or --apcu-prefix for dump-autoload command) flag to let people use apcu autoloading in a deterministic output way if that is needed
• Fixed version guesser to look at remote branches as well as local ones
• Lots of minor bug fixes and improvements

[2.0.0-RC1] 2020-09-10

• Added more advanced filtering to avoid loading all versions of all referenced packages when resolving dependencies, which should reduce memory usage further in some cases
• Added support for many new lib-* packages in the platform repository and improved version detection for some ext-* and lib-* packages
• Added an --ask flag to create-project command to make Composer prompt for the install dir name, useful for project install instructions
• Added support for tar in artifact repositories
• Added a cache-read-only config option to make the cache usable in read only mode for containers and such
• Added better error reporting for a few more specific cases
• Added a new optional available-package-patterns attribute for v2-format Composer repositories, see UPGRADE for details
• Fixed more PHP 8 compatibility issues
• Lots of minor bug fixes for regressions

[2.0.0-alpha3] 2020-08-03

• Breaking: Zip archives loaded by artifact repositories must now have a composer.json on top level, or a max of one folder on top level of the archive
• Added --no-dev support to show and outdated commands to skip dev requirements
• Added support for multiple --repository flags being passed into the create-project command, only useful in combination with --add-repository to persist them to composer.json
• Added a new optional list API endpoint for v2-format Composer repositories, see UPGRADE for details
• Fixed show -a command not listing anything
• Fixed solver bug where it ended in a "Reached invalid decision id 0"
• Fixed updates of git-installed packages on windows
• Lots of minor bug fixes

[2.0.0-alpha2] 2020-06-24

Commits

• 66f4e5d Release 2.0.1
• 9bfddad Make sure no unknown files get excluded from the phar, fixes #9331
• b1d2842 Add more backticks for consistency
• 556faf1 Merge pull request #9330 from fredden/markdown-escape
• 4c424ac Use quotes instead of escaping special characters
• fa3f1d5 Update xdebug-handler
• b4f0f4d Fix php8 file being missing from phar, refs #9331
• a3f9d30 Escape special characters in Markdown files
• 191196d Detect broken packagist.org mirrors and fix them on the fly, refs #9297
• 8d01817 Update changelog for 2.0 🎉
• Additional commits viewable in compare view

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