Merge remote-tracking branch 'origin/master' into main

setup.py

@@ -34,7 +34,7 @@
 
 # Get the version string. Cannot be done with import!
 with open(os.path.join("intbitset", "intbitset_version.py"), "rt") as f:
-    version = re.search('__version__\s*=\s*"(?P<version>.*)"\n', f.read()).group("version")
+    version = re.search(r'__version__\s*=\s*"(?P<version>.*)"\n', f.read()).group("version")
 
 
 extra_compile_args = []