py(deps) Bump libtmux 0.52.1 -> 0.53.0 (#1003)

## libtmux 0.52.1 -> 0.53.0

Bug fix for session attaching

## Bug fix for `tmuxp load`

### User Experience

After running `tmuxp load`, users would see this traceback printed to their terminal after detaching:

```
Traceback (most recent call last):
  File "/home/d/.local/bin/tmuxp", line 7, in <module>
    sys.exit(cli.cli())
  ...
  File ".../tmuxp/cli/load.py", line 152, in _load_attached
    builder.session.attach()
  File ".../libtmux/session.py", line 332, in attach
    self.refresh()
  File ".../libtmux/neo.py", line 242, in fetch_obj
    raise exc.TmuxObjectDoesNotExist(...)
libtmux.exc.TmuxObjectDoesNotExist: Could not find object
```

### Root Cause

The issue was caused by libtmux's `Session.attach()` calling `refresh()` after `attach-session` returned. Since `attach-session` is a **blocking interactive command**, the session state can change arbitrarily during attachment - including being killed entirely.

### Timeline

- **Feb 2024**: 9a5147aa - `Session.attach()` was added with the `refresh()` call
- **Nov 2025**: tmuxp fdafdd2b switched from `attach_session()` to `attach()`
- Users started experiencing the bug

### Fix

The fix is in libtmux: tmux-python/libtmux#616

This PR adds a regression test to tmuxp to ensure the behavior is documented and tested.

Author: tony

CHANGES

@@ -31,6 +31,18 @@ $ pipx install --suffix=@next 'tmuxp' --pip-args '\--pre' --force
 
 <!-- To maintainers and contributors: Please add notes for the forthcoming version below -->
 
+### Breaking changes
+
+#### libtmux 0.52.1 (#1001)
+
+libtmux minimum version bumped from 0.52.1 -> 0.53.0.
+
+### Bug fixes
+
+#### Fixed traceback on session load (#1002, #1003)
+
+Fixed issue where session killed tracebacks should show after `tmuxp load`'s attach.
+
 ## tmuxp 1.61.0 (2025-12-07)
 
 ### Breaking changes

pyproject.toml

@@ -39,7 +39,7 @@ include = [
   { path = "conftest.py", format = "sdist" },
 ]
 dependencies = [
-  "libtmux~=0.52.1",
+  "libtmux~=0.53.0",
   "colorama>=0.3.9",
   "PyYAML>=6.0"
 ]