treewide: add final newline

pkgs/tools/security/bundler-audit/gemset.nix

@@ -20,4 +20,4 @@
     };
     version = "1.0.1";
   };
-}
+}

pkgs/tools/security/metasploit/gemset.nix

@@ -1401,4 +1401,4 @@
     };
     version = "2.4.2";
   };
-}
+}