Update GitHub Actions workflows. (#949)

This PR was automatically generated by the
update-workflows-single-bridged-provider workflow in the pulumi/ci-mgmt
repo, from commit 6b71554f056350c1f980f9517cb2e899b0a3e5a5.

.github/workflows/run-acceptance-tests.yml

@@ -436,10 +436,6 @@ jobs:
 name: run-acceptance-tests
 on:
   pull_request:
-    branches:
-    - master
-    - v*
-    - feature*
     paths-ignore:
     - CHANGELOG.md
   repository_dispatch: