chore(bigframes): fix nox formatter (#16767)

Copied the format command from the nox `blacken`

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: sycai

packages/bigframes/noxfile.py

@@ -191,6 +191,15 @@ def format(session):
         *LINT_PATHS,
     )
 
+    # 3. Run Ruff to format code
+    session.run(
+        "ruff",
+        "format",
+        f"--target-version=py{ALL_PYTHON[0].replace('.', '')}",
+        "--line-length=88",  # Standard Black line length
+        *LINT_PATHS,
+    )
+
 
 @nox.session(python=DEFAULT_PYTHON_VERSION)
 def lint_setup_py(session):