Add convenience script for updating Bazelmod lockfile and tidying

Author: jjudd

scripts/bzlmod-update.sh

@@ -0,0 +1,9 @@
+#!/bin/env bash
+set -euxo pipefail
+
+bazel mod deps --lockfile_mode=update
+bazel mod tidy
+
+cd "$(dirname "$0")/../tests"
+bazel mod deps --lockfile_mode=update
+bazel mod tidy