* Continue to set local scheme based on env var

  in `__version__.py` for consistency.

* Don't require specific setuptools or [toml] extra from setuptools_scm.
  We aren't configuring setuptools_scm in pyproject.toml anyway, and
  setuptools_scm itself will specify a fairly recent version of
  setuptools (we have no special requirement ourselves)

* no longer use env var for version_scheme in setup.py, since we're now
  hard-coding release-branch-semver.

labscript_devices/__version__.py

@@ -8,7 +8,11 @@
 root = Path(__file__).parent.parent
 if (root / '.git').is_dir():
     from setuptools_scm import get_version
-    __version__ = get_version(root, version_scheme="release-branch-semver")
+    __version__ = get_version(
+        root,
+        version_scheme="release-branch-semver",
+        local_scheme=os.getenv("SCM_LOCAL_SCHEME", "node-and-date"),
+    )
 else:
     try:
         __version__ = importlib_metadata.version(__package__)

pyproject.toml

@@ -1,3 +1,3 @@
 [build-system]
-requires = ["setuptools>=42", "wheel", "setuptools_scm[toml]>=4.1.0"]
+requires = ["setuptools", "wheel", "setuptools_scm>=4.1.0"]
 build-backend = "setuptools.build_meta"

setup.py

@@ -1,9 +1,9 @@
 import os
 from setuptools import setup
 
-VERSION_SCHEME = {
-    "version_scheme": os.getenv("SCM_VERSION_SCHEME", "release-branch-semver"),
-    "local_scheme": os.getenv("SCM_LOCAL_SCHEME", "node-and-date"),
-}
-
-setup(use_scm_version=VERSION_SCHEME)
+setup(
+    use_scm_version={
+        "version_scheme": "release-branch-semver",
+        "local_scheme": os.getenv("SCM_LOCAL_SCHEME", "node-and-date"),
+    }
+)