maintainers: add cybershadow

maintainers/maintainer-list.nix

···
     githubId = 16950437;
     name = "cwyc";
   };
+  cybershadow = {
+    name = "Vladimir Panteleev";
+    email = "[e-mail]";
+    matrix = "@cybershadow:cy.md";
+    github = "CyberShadow";
+    githubId = 160894;
+
+    keys = [{
+      fingerprint = "BBED 1B08 8CED 7F95 8917 FBE8 5004 F0FA D051 576D";
+    }];
+  };
   cynerd = {
     name = "Karel Kočí";
     email = "[e-mail]";