test(updater): Update sentry-cli branch assertion

sentry-cli currently has main and master pointing at the same HEAD, so
the updater emits both names in mainBranch output. Match that fixture
output instead of requiring master only.

Author: jpnurmi

updater/tests/update-dependency.Tests.ps1

@@ -220,7 +220,7 @@ switch ($action)
                 $output | Should -Contain 'latestTag=0.28.0'
                 $output | Should -Contain 'latestTagNice=v0.28.0'
                 $output | Should -Contain 'url=https://github.com/getsentry/sentry-cli'
-                $output | Should -Contain 'mainBranch=master'
+                $output | Should -Contain 'mainBranch=main master'
             }
         }