allow psr 7 v2 and update dependencies

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4bbdbe9) 59.90% compared to head (dd30ef2) 59.90%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #30 +/- ## ========================================= Coverage 59.90% 59.90% Complexity 466 466 ========================================= Files 62 62 Lines 1549 1549 ========================================= Hits 928 928 Misses 621 621 ``` | [Files Changed](https://app.codecov.io/gh/facile-it/php-openid-client/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=facile-it) | Coverage Δ | | |---|---|---| | [src/Claims/AbstractClaims.php](https://app.codecov.io/gh/facile-it/php-openid-client/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=facile-it#diff-c3JjL0NsYWltcy9BYnN0cmFjdENsYWltcy5waHA=) | `81.63% <ø> (ø)` | | | [...suer/Metadata/Provider/CachedProviderDecorator.php](https://app.codecov.io/gh/facile-it/php-openid-client/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=facile-it#diff-c3JjL0lzc3Vlci9NZXRhZGF0YS9Qcm92aWRlci9DYWNoZWRQcm92aWRlckRlY29yYXRvci5waHA=) | `88.88% <ø> (ø)` | | | [src/Issuer/Metadata/Provider/DiscoveryProvider.php](https://app.codecov.io/gh/facile-it/php-openid-client/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=facile-it#diff-c3JjL0lzc3Vlci9NZXRhZGF0YS9Qcm92aWRlci9EaXNjb3ZlcnlQcm92aWRlci5waHA=) | `71.87% <ø> (ø)` | |

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.