maintainers: add octvs as maintainer

maintainers/maintainer-list.nix

···
     github = "octodi";
     githubId = 127038896;
   };
+  octvs = {
+    name = "octvs";
+    email = "[e-mail]";
+    matrix = "@octvs:matrix.org";
+    github = "octvs";
+    githubId = 42993892;
+  };
   oddlama = {
     email = "[e-mail]";
     github = "oddlama";