Reported as incompatible dependency when using ng cli

[maitredede]

Describe the bug
When trying to upgrade angular from 8 to 9 following angular upgrade guide (uses ng cli) :

Package "angular-user-idle" has an incompatible peer dependency to "@angular/common" (requires "^6.0.0 || ^12.0.0" (extended), would install "9.1.13")

To Reproduce
Steps to reproduce the behavior:

1. Create an angular 8 projet, add the lib as dependency
2. Ugrade to angular 9 : ng update @angular/core@9 @angular/cli@9 --force
3. Fails with npm error

Expected behavior
Upgrade should perform without the dependency error

Additional context
Using node 12.

Idea
The dependency semver is "^6.0.0 || ^12.0.0" (major v6 or major v12). Should not it be something more like >=^6.0.0 && <= ^12.0.0 (between major 6 and major 12 included) ?