fix: the BCR presubmit Bazel version must match the version specified for rules_bazel_integration_test (#894)

Related to
bazelbuild/bazel-central-registry#1416.

Author: cgrindel

.bcr/presubmit.yml

@@ -3,8 +3,8 @@ bcr_test_module:
   matrix:
     platform: ["macos"]
     bazel:
-      - 6.x
-      - 7.x
+      # This needs to exactly match the value used in .bazelversion at the root.
+      - 7.0.0
   tasks:
     run_tests:
       name: "Run test module"