chore: update demo to the latest cookiecutter-robust-python

Author: 56kyle

.cookiecutter.json

@@ -1,5 +1,5 @@
 {
-  "_commit": "8cc5fcc6ded1cd4e6fc748b0ed0acb7e664df367",
+  "_commit": "25270e77695521310ba772b545dc194eeea1cb78",
   "_template": "C:\\Users\\56kyl\\source\\repos\\cookiecutter-robust-python",
   "add_rust_extension": false,
   "author": "Kyle Oliver",

.cruft.json

@@ -1,6 +1,6 @@
 {
   "template": "C:\\Users\\56kyl\\source\\repos\\cookiecutter-robust-python",
-  "commit": "8cc5fcc6ded1cd4e6fc748b0ed0acb7e664df367",
+  "commit": "25270e77695521310ba772b545dc194eeea1cb78",
   "checkout": null,
   "context": {
     "cookiecutter": {
@@ -18,7 +18,7 @@
       "license": "MIT",
       "development_status": "Development Status :: 1 - Planning",
       "_template": "C:\\Users\\56kyl\\source\\repos\\cookiecutter-robust-python",
-      "_commit": "8cc5fcc6ded1cd4e6fc748b0ed0acb7e664df367"
+      "_commit": "25270e77695521310ba772b545dc194eeea1cb78"
     }
   },
   "directory": null

scripts/util.py

@@ -78,8 +78,7 @@ def create_release_branch(new_version: str) -> None:
     """Creates a release branch."""
     commands: list[list[str]] = [
         ["git", "status", "--porcelain"],
-        ["git", "branch", "-b", f"release/{new_version}", "develop"],
-        ["git", "checkout", f"release/{new_version}"],
+        ["git", "checkout", "-b", f"release/{new_version}", "develop"],
     ]
     for command in commands:
         subprocess.run(command, cwd=REPO_FOLDER, capture_output=True, check=True)