1. 1. Summary

• Update `.bazeliskrc` and `.bazelversion` to use the successful `mongodb_bazel` waterfall build `da250b22cec659bb99d2c36c9c10a2a87fc70fd2`.
• Keep `buildscripts/generate_bazel_spawn_pb2.py` aligned with the pinned Bazel ref.

This makes MongoDB builds use the published waterfall Bazel binary instead of a patch-build artifact. The change is limited to Bazel version/provenance metadata; no runtime behavior changes.

1. 1. Testing

• `bazel run format`
• `//buildscripts/tests:test_package_test_provenance` with Bazel `7.5.0-mongo_da250b22ce` (passed)
• Waterfall Bazel binary checksum verification (passed)