Update watchdog requirement from ~=2.1 to >=2.1,<7.0 in /pkg_lifeblood

Updates the requirements on [watchdog](https://github.com/gorakhargosh/watchdog) to permit the latest version.
- [Release notes](https://github.com/gorakhargosh/watchdog/releases)
- [Changelog](https://github.com/gorakhargosh/watchdog/blob/master/changelog.rst)
- [Commits](gorakhargosh/watchdog@v2.1.0...v6.0.0)

---
updated-dependencies:
- dependency-name: watchdog
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

pkg_lifeblood/setup.cfg

@@ -28,7 +28,7 @@ install_requires =
     pywin32==306; platform_system=="Windows"
     semantic-version~=2.10
     toml~=0.10
-    watchdog~=2.1
+    watchdog>=2.1,<7.0
 
 [options.packages.find]
 where = src