v13.20.0
[13.x] Fix TrustProxies at:* when multiple proxies are used (#60726)
[13.x] Fix JsonApiResource relationships resolved through a closure (#60752)
add method to get contents of uploaded file
Improve InteractsWithInput::enum test (#53057)
normalize HTTP client request header lookups (#60734)
[11.x] PHPUnit 11 Forward Compatibility (#48796)
[7.x] Fix parent call (#39909)
[13.x] Enforce stricter assertions (#59749)
[13.x] Adds first-party support for `image` processing (#59276)
Add withCookies method to ResponseTrait (#60503)
Use Null and Isset coalescing when possible (#59690)
[11.x] Fix client path value in file uploads (#53941)
Let toPrettyJson() accepts options (#56876)