chore: relax constraint of `psr/log`

[drupol]

psr/log support or ^3 but not ^2 which is still required by some libraires.

This PR fixes this behavior by allowing any version.

This won't have any impact:

• https://packagist.org/packages/psr/log#2.0.0
• https://packagist.org/packages/psr/log#3.0.0