Use upstream complement for tests

Author: Fizzadar

.github/workflows/beeper-ci.yml

@@ -72,10 +72,8 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/checkout@v2
         with:
-          repository: beeper/complement
+          repository: matrix-org/complement
           path: complement
-          # TODO: upgrade this or find a better way to keep aligned with upstream
-          ref: 94fe6b9aa5560cb6a7fc4518472070287cb5d42a
       - name: Install complement dependencies
         run: |-
           sudo apt-get -qq update