Switch project versioning to setuptools-scm

Update `pyproject.toml` to use dynamic versioning by adding `setuptools_scm[simple]` to build requirements and replacing the hardcoded project version with `dynamic = ["version"]`. This moves version management to SCM tags instead of a manually maintained value.

Author: C-Achard

pyproject.toml

@@ -1,10 +1,9 @@
 [build-system]
 build-backend = "setuptools.build_meta"
-requires = [ "setuptools>=68" ]
+requires = [ "setuptools>=68", "setuptools-scm[simple]>=9" ]
 
 [project]
 name = "deeplabcut-live-gui"
-version = "2.0.0rc1"
 description = "PySide6-based GUI to run real time pose estimation experiments with DeepLabCut"
 readme = "README.md"
 keywords = [ "deep learning", "deeplabcut", "gui", "pose estimation", "real-time" ]
@@ -22,6 +21,8 @@ classifiers = [
   "Programming Language :: Python :: 3.12",
   "Topic :: Scientific/Engineering :: Artificial Intelligence",
 ]
+# version = "2.0.0rc1"
+dynamic = [ "version" ]
 dependencies = [
   "cv2-enumerate-cameras",
   "deeplabcut-live>=1.1",