install version 3.1.2 instead of 3.0

Hi everyone!

I think this issue could be considered as a composer version constraint question.

Caret's "^" symbol allows the version to go up as expected.

When you see a caret constraint like ^3.0, it signifies that Composer is allowed to install any version of the package that is compatible with the specified version, but not including the next major version. The caret constraint follows the Semantic Versioning (SemVer) rules.

For example:

3.0.0 is allowed.
3.1.0 is allowed.
3.1.5 is allowed.
3.2.0 is allowed.
4.0.0 is not allowed.

https://getcomposer.org/doc/articles/versions.md#caret-version-range-

As a solution to the initial question (to support both Drupal 8 and Drupal 9), it's possible to use "~3.0" notation.
composer require 'drupal/permissions_by_term:~3.0'

With the tilde (~) operator, Composer will allow any version equal to or greater than 3.0.0 and less than 3.1.0. This indicates that only the minor version can vary within the 3.0 major version.

Here are some examples of what versions would be allowed:

3.0.0 is allowed.
3.0.1 is allowed.
3.0.5 is allowed.
3.1.0 is not allowed.

I suggest also closing this issue.

I agree with @kufliievskyi. This seems to be solely an issue with the version constrained used to require the module into the project. Closing.