chore: update bump_version script

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

bin/bump_version.py

@@ -1,8 +1,13 @@
 #!/usr/bin/env python3
 
+# /// script
+# dependencies = ["click", "packaging"]
+# ///
+
 
 from __future__ import annotations
 
+import configparser
 import glob
 import os
 import subprocess
@@ -13,8 +18,6 @@ from pathlib import Path
 import click
 from packaging.version import InvalidVersion, Version
 
-import cibuildwheel
-
 config = [
     # file path, version find/replace format
     ("README.md", "cibuildwheel=={}"),
@@ -34,7 +37,10 @@ OFF = "\u001b[0m"
 
 @click.command()
 def bump_version() -> None:
-    current_version = cibuildwheel.__version__
+    # Update if moving setup.cfg to pyproject.toml
+    cfg = configparser.ConfigParser()
+    cfg.read("setup.cfg")
+    current_version = cfg["metadata"]["version"]
 
     try:
         commit_date_str = subprocess.run(