Update dependency laravel/framework to v6 - abandoned

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This PR contains the following updates:

Package	Type	Update	Change
laravel/framework (source)	require	major	5.5.* -> 6.18.*

By merging this PR, the below issues will be automatically resolved and closed:

Severity	CVSS Score	CVE	GitHub Issue
High	9.8	WS-2020-0144	#14

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• [ ] If you want to rebase/retry this PR, click this checkbox. ⚠ Warning: custom changes will be lost.

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⚠ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: composer.lock

Command failed: composer update laravel/framework --with-dependencies --ignore-platform-reqs --no-ansi --no-interaction --no-scripts --no-autoloader --no-plugins
Dependency "doctrine/inflector" is also a root requirement, but is not explicitly allowed. Ignoring.
Dependency "erusev/parsedown" is also a root requirement, but is not explicitly allowed. Ignoring.
Dependency "symfony/css-selector" is also a root requirement, but is not explicitly allowed. Ignoring.
Loading composer repositories with package information
Warning from https://repo.packagist.org: Support for Composer 1 is deprecated and some packages will not be available. You should upgrade to Composer 2. See https://blog.packagist.com/deprecating-composer-1-support/
Info from https://repo.packagist.org: #StandWithUkraine
Updating dependencies (including require-dev)
PHP Fatal error:  Allowed memory size of 1610612736 bytes exhausted (tried to allocate 4096 bytes) in phar:///home/ubuntu/composer/1.10.26/bin/composer/src/Composer/DependencyResolver/RuleSetGenerator.php on line 129

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Edited/Blocked Notification

Renovate will not automatically rebase this PR, because it does not recognize the last commit author and assumes somebody else may have edited the PR.

You can manually request rebase by checking the rebase/retry box above.

⚠ Warning: custom changes will be lost.

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Autoclosing Skipped

This PR has been flagged for autoclosing. However, it is being skipped due to the branch being already modified. Please close/delete it manually or report a bug if you think this is in error.