maintainers: add felixalbrigtsen

maintainers/maintainer-list.nix

···
     keys = [{ fingerprint = "F5F0 2BCE 3580 BF2B 707A  AA8C 2FD3 4A9E 2671 91B8"; }];
     matrix = "@felipeqq2:pub.solar";
   };
+  felixalbrigtsen = {
+    email = "[e-mail]";
+    github = "felixalbrigtsen";
+    githubId = 64613093;
+    name = "Felix Albrigtsen";
+    matrix = "@felixalb:pvv.ntnu.no";
+  };
   felixscheinost = {
     name = "Felix Scheinost";
     email = "[e-mail]";