Use declarative metadata

- Move to pyproject.toml metadata
- Update references to `setup.py`
- Use pypa/build
- Update workflows and tooling

utils/bump_version.py

@@ -23,19 +23,23 @@ def stringify_version(version_info, in_develop=True):
 
 def bump_version(path, version_info, in_develop=True):
     version = stringify_version(version_info, in_develop)
-    release = version
-    if in_develop:
-        version += '+'
 
-    with open(path, 'r+', encoding='utf-8') as f:
-        body = f.read()
-        body = re.sub(r"(?<=__version__ = ')[^']+", version, body)
-        body = re.sub(r"(?<=__released__ = ')[^']+", release, body)
-        body = re.sub(r"(?<=version_info = )\(.*\)", str(version_info), body)
+    with open(path, 'r', encoding='utf-8') as f:
+        lines = f.read().splitlines()
 
-        f.seek(0)
-        f.truncate(0)
-        f.write(body)
+    for i, line in enumerate(lines):
+        if line.startswith('__version__ = '):
+            lines[i] = f"__version__ = '{version}'"
+            continue
+        if line.startswith('version_info = '):
+            lines[i] = f'version_info = {version_info}'
+            continue
+        if line.startswith('_in_development = '):
+            lines[i] = f'_in_development = {in_develop}'
+            continue
+
+    with open(path, 'w', encoding='utf-8') as f:
+        f.write('\n'.join(lines) + '\n')
 
 
 def parse_version(version):