deps: update dependency watchdog to v4 (#360)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [watchdog](https://togithub.com/gorakhargosh/watchdog)
([changelog](https://togithub.com/gorakhargosh/watchdog/blob/master/changelog.rst))
| `>=3.0.0,<3.1` -> `>=4,<4.1` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/watchdog/4.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/watchdog/4.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/watchdog/3.0.0/4.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/watchdog/3.0.0/4.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>gorakhargosh/watchdog (watchdog)</summary>

###
[`v4.0.0`](https://togithub.com/gorakhargosh/watchdog/releases/tag/v4.0.0):
4.0.0

[Compare
Source](https://togithub.com/gorakhargosh/watchdog/compare/v3.0.0...v4.0.0)

-   Drop support for Python 3.7.
-   Add support for Python 3.12.
- \[snapshot] Add typing to `dirsnapshot`
([#&#8203;1012](https://togithub.com/gorakhargosh/watchdog/issues/1012))
- \[snapshot] Added `DirectorySnapshotDiff.ContextManager`
([#&#8203;1011](https://togithub.com/gorakhargosh/watchdog/issues/1011))
- \[events] `FileSystemEvent`, and subclasses, are now `dataclass`es,
and their `repr()` has changed
- \[windows] `WinAPINativeEvent` is now a `dataclass`, and its `repr()`
has changed
- \[events] Log `FileOpenedEvent`, and `FileClosedEvent`, events in
`LoggingEventHandler`
-   \[tests] Improve `FileSystemEvent` coverage
-   \[watchmedo] Log all events in `LoggerTrick`
- \[windows] The
`observers.read_directory_changes.WATCHDOG_TRAVERSE_MOVED_DIR_DELAY`
hack was removed. The constant will be kept to prevent breaking other
softwares.
- Thanks to our beloved contributors:
[@&#8203;BoboTiG](https://togithub.com/BoboTiG),
[@&#8203;msabramo](https://togithub.com/msabramo)

</details>

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setup.py

@@ -48,7 +48,7 @@
             "sphinx>=7.2.2,<7.3",
             "sphinx-rtd-theme>=2,<2.1",
             "myst-parser>=2.0.0,<2.1",
-            "watchdog>=3.0.0,<3.1",
+            "watchdog>=4,<4.1",
         ],
         "test": [
             "coverage>=7.4,<7.5",