Tag v0.46.1 via v0.46.x branch

With snapshots support upcoming via #587/#590.

Author: tony

CHANGES

@@ -15,6 +15,13 @@ $ pip install --user --upgrade --pre libtmux
 
 - _Future release notes will be placed here_
 
+## libtmux 0.46.0 (2025-03-16)
+
+_Maintenance only, no bug fixes or new features_
+
+A version branch has been created at v0.46.x, the next release of v0.47.0 may 
+be a few months in waiting (watchers / snapshots are in development in #587). 
+
 ### Documentation
 
 - Typo fix for `Pane.send_keys` (#593), thank you @subbyte!