Bump bazel-public/bazel from 7.1.1 to 7.2.1

Bumps bazel-public/bazel from 7.1.1 to 7.2.1.

---
updated-dependencies:
- dependency-name: bazel-public/bazel
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM gcr.io/bazel-public/bazel:7.1.1 AS builder
+FROM gcr.io/bazel-public/bazel:7.2.1 AS builder
 
 WORKDIR /wgkex