[build] Check results of subprocess.run in wpimath/generate_quickbuf.py (#8069)

The generator was calling a binary of the wrong architecture and failing
internally, but passing the build (incorrectly).  Explode right away.

Signed-off-by: Austin Schuh <austin.linux@gmail.com>

wpimath/generate_quickbuf.py

@@ -15,7 +15,7 @@ def generate_quickbuf(
     proto_files = proto_dir.glob("*.proto")
     for path in proto_files:
         absolute_filename = path.absolute()
-        subprocess.run(
+        subprocess.check_call(
             [
                 protoc,
                 f"--plugin=protoc-gen-quickbuf={quickbuf_plugin}",