Allow `psr/http-message:^2` installation

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
psr/http-message	require-dev	major	^1.1 -> ^2.0

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Release Notes

php-fig/http-message

### [`v2.0`](https://togithub.com/php-fig/http-message/releases/tag/2.0) [Compare Source](https://togithub.com/php-fig/http-message/compare/1.1...2.0) Added return types, see https://www.php-fig.org/psr/psr-7/meta/[#​72](https://togithub.com/php-fig/http-message/issues/72)-type-additions

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