Fix failing tests for 3.x

[tonypaulbarker]

https://github.com/localgovdrupal/localgov_microsites_base/pull/334/checks

Error: Your requirements could not be resolved to an installable set of packages.

Problem 1
- localgovdrupal/localgov_microsites is locked to version 4.x-dev and an update of this package was not requested.
- localgovdrupal/localgov_microsites 4.x-dev requires localgovdrupal/localgov_microsites_base ^2.0 -> found localgovdrupal/localgov_microsites_base[2.0.0-beta1, ..., 2.x-dev] but it conflicts with your root composer.json require (3.x-dev as 1).

Problem 1
- localgovdrupal/localgov_microsites is locked to version 4.x-dev and an update of this package was not requested.
- localgovdrupal/localgov_microsites 4.x-dev requires localgovdrupal/localgov_microsites_base ^2.0 -> found localgovdrupal/localgov_microsites_base[2.0.0-beta1, ..., 2.x-dev] but it conflicts with your root composer.json require (3.x-dev as 1).

Installation failed, reverting ./composer.json and ./composer.lock to their original content.
Error: Process completed with exit code 2.