Use Where-Object instead of alias in buildmodule.tests.ps1 by kvprasoon · Pull Request #1360 · PowerShell/PSScriptAnalyzer

The first failure is a relatively new, but known sporadic failure, for which PR #1358 has been opened.
The other 4 failures started to happen only this week without a code change in master and are probably due to a breaking change in an AppVeyor image update.
Concluding, don't worry about them, they are unrelated and not blocking your PR from being merged but ideally, we want to have them fixed in master first before merging more PRs.