build(package): update minimal yarn to v1.13.0

[meeroslav]

The @angular/cli as of version 9 requires minimum yarn v1.13.0 to work

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[X] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Engine specification in package.json requires a minimal version of yarn to be 1.9.2 but inner dependency @angular/cli fails if yarn version is older than v1.13.0

What is the new behavior?

Engine specification in package.json requires a minimal version of yarn to be 1.13.0.

Does this PR introduce a breaking change?

[ ] Yes
[X] No

[ngrxbot]

Preview docs changes for b9ee2ff at https://previews.ngrx.io/pr2467-b9ee2ff/