ENH: Add tomli as dependency, use tomllib when available

Author: effigies

requirements-dev.txt

@@ -3,3 +3,4 @@ pytest
 pytest-cov
 nibabel
 networkx
+tomli; python_version < '3.11'

tools/update_requirements.py

@@ -2,15 +2,18 @@
 import sys
 from pathlib import Path
 
-import tomli
+try:
+    import tomllib
+except ImportError:
+    import tomli as tomllib
 
 repo_root = Path(__file__).parent.parent
 pyproject_toml = repo_root / 'pyproject.toml'
 reqs = repo_root / 'requirements.txt'
 min_reqs = repo_root / 'min-requirements.txt'
 
 with open(pyproject_toml, 'rb') as fobj:
-    config = tomli.load(fobj)
+    config = tomllib.load(fobj)
     project = config['project']
 requirements = project['dependencies'] + project['optional-dependencies']['full']