flexget: 3.9.16 -> 3.9.18

Diff: https://github.com/Flexget/Flexget/compare/refs/tags/v3.9.16...v3.9.18

Changelog: https://github.com/Flexget/Flexget/releases/tag/v3.9.18

pkgs/applications/networking/flexget/default.nix

···
 in
 python.pkgs.buildPythonApplication rec {
   pname = "flexget";
-  version = "3.9.16";
+  version = "3.9.18";
   format = "pyproject";
 
   # Fetch from GitHub in order to use `requirements.in`
···
     owner = "Flexget";
     repo = "Flexget";
     rev = "refs/tags/v${version}";
-    hash = "sha256-p92wiQ01NBFs5910wngkNHnE/mOfs9XnOLUEOyk9VpA=";
+    hash = "sha256-Wxi6+6c/PK990YCoFKBMxJbYgMkS9y46hNIlkVhjbA4=";
   };
 
   postPatch = ''