Format with nixfmt

Change-Id: If9839d2c3308538ac8f3e166b69675d3b40bd7d9
diff --git a/modules/cache.nix b/modules/cache.nix
index eee9d79..89bbce6 100644
--- a/modules/cache.nix
+++ b/modules/cache.nix
@@ -1,8 +1,7 @@
 {
   nix.settings = {
     substituters = [ "https://cache.garnix.io" ];
-    trusted-public-keys = [
-      "cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g="
-    ];
+    trusted-public-keys =
+      [ "cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=" ];
   };
 }