presubmit.yml: Set skip_use_bazel_version_for_test: true (#347)

This will fix recent test breakage in Bazel downstream:
https://buildkite.com/bazel/bazel-at-head-plus-downstream/builds/1588#91ed10dd-2b13-4cee-99cc-88a2e8e58a31

Similar issue and fix:
https://github.com/bazelbuild/bazel/issues/10554
https://github.com/bazelbuild/rules_nodejs/pull/1538

.bazelci/presubmit.yml

diff --git a/.bazelci/presubmit.yml b/.bazelci/presubmit.yml
index ea43970..3186434 100644
--- a/.bazelci/presubmit.yml
+++ b/.bazelci/presubmit.yml
@@ -18,6 +18,8 @@
     # As a regression test for #225, check that wheel targets still build when
     # their package path is qualified with the repo name.
     - "@rules_python//experimental/examples/..."
+    # We control Bazel version in integration tests, so we don't need USE_BAZEL_VERSION for tests.
+    skip_use_bazel_version_for_test: true
     test_targets:
     - "..."
 platforms: