#676: Update rufus-scheduler requirement from = 3.8.1 to = 3.9.1

Updates the requirements on [rufus-scheduler](https://github.com/jmettraux/rufus-scheduler) to permit the latest version.
- [Changelog](https://github.com/jmettraux/rufus-scheduler/blob/master/CHANGELOG.md)
- [Commits](jmettraux/rufus-scheduler@v3.8.1...v3.9.1)

---
updated-dependencies:
- dependency-name: rufus-scheduler
  dependency-type: direct:production
...

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lazylead.gemspec

@@ -68,7 +68,7 @@ tasks instead of solving technical problems."
   s.add_runtime_dependency "railties", "6.1.3"
   s.add_runtime_dependency "require_all", "3.0.0"
   s.add_runtime_dependency "rubyzip", "2.3.2"
-  s.add_runtime_dependency "rufus-scheduler", "3.8.1"
+  s.add_runtime_dependency "rufus-scheduler", "3.9.1"
   s.add_runtime_dependency "slop", "4.9.2"
   s.add_runtime_dependency "sqlite3", "1.4.4"
   s.add_runtime_dependency "tempfile", "0.1.2"