Loosen psr/container version constraint

[MasterOdin]

Closes #2227

cakephp/cakephp@5.0.2 loosened their version constraint of psr/container when then allows us to loosen it as well, allowing both ^1.1 or ^2.0 to be used based on other things you might install alongside phinx.

[MasterOdin]

@dereuromark This should not have been merged yet since one of the CI checks is failing from this change. I'm also not sure how best to resolve this, where composer update --prefer-lowest won't install psr/container@^1.1 as it doesn't install the lowest version of transitive dependencies, and one of the transitive dependencies ends up with psr/container@^2.0. This causes dereuromark/composer-prefer-lowest tool to fail.

I suppose a "fix" would be to install the lowest version of a transitive dependency as a devDependency within phinx (at least in the CI check), but that's certainly hacky.

[dereuromark]

composer is sometimes a bit stupid
62fda40 should make it green again