fix(update): handle retry for cargo version pinning after version bump

Author: diemol

rake_tasks/rust.rake

@@ -14,8 +14,15 @@ end
 
 desc 'Update the rust lock files'
 task :update do
+  # The first repin after a version bump can fail due to a stale checksum in
+  # Cargo.Bazel.lock; a second run lets Bazel reconcile and succeeds.
   puts 'pinning cargo versions'
-  Bazel.execute('fetch', ['--repo_env=CARGO_BAZEL_REPIN=true'], '@crates//:all')
+  begin
+    Bazel.execute('fetch', ['--repo_env=CARGO_BAZEL_REPIN=true'], '@crates//:all')
+  rescue RuntimeError
+    puts 'repin failed, retrying...'
+    Bazel.execute('fetch', ['--repo_env=CARGO_BAZEL_REPIN=true'], '@crates//:all')
+  end
 end
 
 desc 'Pin Rust dependencies'