Add new required field to presubmit.yml (#10)

.bcr/presubmit.yml

diff --git a/.bcr/presubmit.yml b/.bcr/presubmit.yml
index ebcd9f9..a90b2ca 100644
--- a/.bcr/presubmit.yml
+++ b/.bcr/presubmit.yml
@@ -4,9 +4,12 @@
   - ubuntu2004
   - macos
   - macos_arm64
+  bazel:
+  - 7.x
 tasks:
   verify_targets:
     name: Verify build targets
     platform: ${{ platform }}
+    bazel: ${{ bazel }}
     build_targets:
     - '@rules_multitool//...'