parca: add `brancz`/`metalmatze` as maintainers, remove `jnsgruk` (#439507)

maintainers/maintainer-list.nix

···
     githubId = 86652;
     name = "Bram Duvigneau";
   };
+  brancz = {
+    email = "[e-mail]";
+    name = "Frederic Branczyk";
+    github = "brancz";
+    githubId = 4546722;
+  };
   braydenjw = {
     email = "[e-mail]";
     github = "braydenjw";
···
     name = "merrkry";
     github = "merrkry";
     githubId = 124278440;
+  };
+  metalmatze = {
+    email = "[e-mail]";
+    name = "Matthias Loibl";
+    github = "metalmatze";
+    githubId = 872251;
   };
   mevatron = {
     email = "[e-mail]";

pkgs/by-name/pa/parca-agent/package.nix

···
     homepage = "https://github.com/parca-dev/parca-agent";
     changelog = "https://github.com/parca-dev/parca-agent/releases/tag/v${finalAttrs.version}";
     license = lib.licenses.asl20;
-    maintainers = with lib.maintainers; [ jnsgruk ];
+    maintainers = with lib.maintainers; [
+      brancz
+      metalmatze
+    ];
     platforms = lib.platforms.linux;
     mainProgram = "parca-agent";
   };

pkgs/by-name/pa/parca-debuginfo/package.nix

···
     changelog = "https://github.com/parca-dev/parca-debuginfo/releases/tag/v${version}";
     homepage = "https://github.com/parca-dev/parca-debuginfo";
     license = lib.licenses.asl20;
-    maintainers = with lib.maintainers; [ jnsgruk ];
+    maintainers = with lib.maintainers; [
+      brancz
+      metalmatze
+    ];
     platforms = lib.platforms.unix;
     mainProgram = "parca-debuginfo";
   };

pkgs/by-name/pa/parca/package.nix

···
     changelog = "https://github.com/parca-dev/parca/releases/tag/v${version}";
     license = lib.licenses.asl20;
     platforms = lib.platforms.linux;
-    maintainers = with lib.maintainers; [ jnsgruk ];
+    maintainers = with lib.maintainers; [
+      brancz
+      metalmatze
+    ];
   };
 }