Pin buildifier for now (#890)

This was updated and has some regressions, pin back to the last known
version to fix CI for now

Closes #890

COPYBARA_INTEGRATE_REVIEW=https://github.com/bazelbuild/rules_cc/pull/890 from keith:ks/pin-buildifier-for-now 295deddf301a63fbb997f91e58036776de1d9753
PiperOrigin-RevId: 981917115
Change-Id: I51eb00bf467fc983a1f1743e1c40bcf2144e5657

.bazelci/presubmit.yml

diff --git a/.bazelci/presubmit.yml b/.bazelci/presubmit.yml
index 3c68838..35eab7a 100644
--- a/.bazelci/presubmit.yml
+++ b/.bazelci/presubmit.yml
@@ -59,8 +59,7 @@
     build_targets:
       - "//..."
 
-buildifier:
-  version: latest
+buildifier: 8.5.1
 
 tasks:
   ubuntu2004_docs: