Altis 12 not fully compatible with PHP 7.4 due to psr/log subdependency

Steps to reproduce:
1. We updated a dev site to Altis 12, with all dependencies, which upgraded `psr/log` from `1.1.4` to `3.0.0`.
2. We deployed this branch to a dev environment still running PHP 7.4, [per the docs page which states that v12 should support both PHP 7.4 and PHP 8](https://docs.altis-dxp.com/guides/updating-php/).
3. Login stopped working on Development, with an error,
```
syntax error, unexpected '|', expecting variable (T_VARIABLE)
```
- That error occurred in file `vendor/psr/log/src/LoggerInterface.php` within `psr/log` v3.0.

`psr/log` versions since 2.0 specifically requires `php: >=8.0.0`, [per packagist](https://packagist.org/packages/psr/log#3.0.0) and the package's `composer.json`.

`composer why` output showing that `psr/log` evaluates to v3 in Altis 12:
```
composer why -t psr/log
psr/log 3.0.0 Common interface for logging libraries
└──monolog/monolog 2.8.0 (requires psr/log ^1.0.1 || ^2.0 || ^3.0)
├──altis/cloud 12.0.4 (requires monolog/monolog ^2.5)
│ └──altis/altis 12.0.0 (requires altis/cloud ^12.0.0)
│ └──humanmade/project dev-php-8-compat (requires altis/altis ^12.0.0)
├──google/apiclient v2.12.6 (requires monolog/monolog ^1.17||^2.0||^3.0)
│ └──humanmade/project dev-php-8-compat (requires google/apiclient ^2.0)
└──maxbanton/cwh v2.0.2 (requires monolog/monolog ^2.0)
└──altis/cloud 12.0.4 (requires maxbanton/cwh ^2.0)
└──altis/altis 12.0.0 (requires altis/cloud ^12.0.0)
└──humanmade/project dev-php-8-compat (requires altis/altis ^12.0.0)
```

Manually pinning `psr/log` to `1.1.4` in the Altis project's `composer.json` appears to resolve the issue, and I can now sign in again on that project's dev environment.

I would expect a subdependency of Altis 12 to support PHP 7.4, because 7.4 is listed as deprecated but not incompatible on the [Updating PHP](https://docs.altis-dxp.com/guides/updating-php/) docs page.

Acceptance criteria:

- [ ] ...

Start by reproducing the PHP 7.4 deployment and inspecting the Altis project's composer.json alongside vendor/psr/log/src/LoggerInterface.php. Confirm which dependency constraint resolves psr/log to 3.0.0, then verify that the resolved dependencies support PHP 7.4 and login works without the syntax error.

Written by the indexing model from the issue text.