Fix bazelci.py branch for buildfarm-testing (#2812)

buildkite/terraform/bazel-testing/pipelines_misc.tf

diff --git a/buildkite/terraform/bazel-testing/pipelines_misc.tf b/buildkite/terraform/bazel-testing/pipelines_misc.tf
index 82e9f20..524b5b8 100644
--- a/buildkite/terraform/bazel-testing/pipelines_misc.tf
+++ b/buildkite/terraform/bazel-testing/pipelines_misc.tf
@@ -116,7 +116,7 @@
     envs = {},
     steps = {
       commands = [
-        "curl -sS \"https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?$(date +%s)\" -o bazelci.py",
+        "curl -sS \"https://raw.githubusercontent.com/bazelbuild/continuous-integration/testing/buildkite/bazelci.py?$(date +%s)\" -o bazelci.py",
         "bash -c 'set -euo pipefail; python3 bazelci.py project_pipeline | tee /dev/tty | buildkite-agent pipeline upload'"
       ]
     }