[Pharo 8.0] Build #87: Fix `Week>>year:week:` to return a correct ISO week (starting on Monday)

There is a new Pharo build available!
 
The status of the build #87 was: FAILURE.

The Pull Request #2508 was integrated: "Fix `Week>>year:week:` to return a correct ISO week (starting on Monday)"
Pull request url: https://github.com/pharo-project/pharo/pull/2508

Issue Url: https://pharo.fogbugz.com/f/cases/2455
Build Url: https://ci.inria.fr/pharo-ci-jenkins2/job/Test%20pending%20pull%20request%20and%20branch%20Pipeline/job/Pharo8.0/87/