DonationInterface requires library psr/log in its composer.json. mediawiki/core has a plan to update the version in T356451: Upgrade psr/log to 3.x.
Additional allow psr/log v3 on the master of the DonationInterface extension allows to stay up to date and keep CI running, when the update on core happens.
Please allow the new version.
This requires also updates to libraries that using the old version as well:
# composer why psr/log wikimedia/donation-interface dev-master requires psr/log (^1.0) amzn/login-and-pay-with-amazon-sdk-php 2.5.0 requires psr/log (^1.0) composer/xdebug-handler 3.0.5 requires psr/log (^1 || ^2 || ^3) monolog/monolog 2.11.0 requires psr/log (^1.0.1 || ^2.0 || ^3.0) wikimedia/smash-pig v1.2.4.2 requires psr/log (^1.0)