Update dependency psr/http-message to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
psr/http-message	require	major	^1.0 -> ^1.0 || ^2.0

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Release Notes

php-fig/http-message

v2.0

Compare Source

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

v1.1

Compare Source

Added parameters 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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[internalsystemerror]

This should be safe to merge. I've checked this out locally and the reason v2 isn't getting installed/tested in our checks, is because composer has config.platform.php fixed to 8.0.99 which prevents install of psr/http-message v2, as support is only added in mezzio/mezzio-router 3.16.0 which dropped support for php 8.0.

Having gone over the code, we're only interacting with the headers, so the changes to getBody introduced in v2, won't affect us here.

Going to ship.