maint: modernize version inference

pyproject.toml

@@ -49,7 +49,6 @@ ignore = [
     "D1",  # missing docstrings. TODO: add this back in.
     "PERF203",  # no try/except in loops
 ]
-ignore-init-module-imports = true
 
 [tool.ruff.lint.per-file-ignores]
 "tests/*.py" = [

src/edges_io/__init__.py

@@ -1,11 +1,12 @@
-from pkg_resources import DistributionNotFound, get_distribution
+from importlib.metadata import PackageNotFoundError, version
 
 try:
-    __version__ = get_distribution(__name__).version
-except DistributionNotFound:
+    __version__ = version(__name__)
+except PackageNotFoundError:
+    # package is not installed
     __version__ = "unknown"
 finally:
-    del get_distribution, DistributionNotFound
+    del version, PackageNotFoundError
 
 from pathlib import Path