security: Allow jitsi-meet

libolm, which jitsi-meet depends on was recently deprecated. This does
not affect me as I don't use jitsi-meet directly. It's installed as a
dependency of another package for a feature which I do not use. I
honestly didn't even know any of my packages depended on jitsi-meet
until now. I'll leave this here until the issue is resolved.

modules/system/security.nix

@@ -8,5 +8,9 @@
   security.apparmor = {
     enable = true;
   };
+
+  nixpkgs.config.permittedInsecurePackages = [
+    "jitsi-meet-1.0.8043"
+  ];
 }