upgrade bazel CI reusable workflow

Author: alexeagle

.github/workflows/ci.yaml

@@ -17,7 +17,7 @@ concurrency:
 
 jobs:
   test:
-    uses: bazel-contrib/.github/.github/workflows/bazel.yaml@v6
+    uses: bazel-contrib/.github/.github/workflows/bazel.yaml@v7.2.3
     with:
       folders: '[".", "e2e/headers", "e2e/smoke", "e2e/nodejs_host", "e2e/conflicting_toolchains"]'
       # stardoc generated docs fail on diff_test with Bazel 6.4.0 so don't test against it in root repository