[OPS-1514] Repin flake inputs

Problem: we need to update flake inputs from time to time

Solution:
- update nixpkgs, serokell-nix (and the rest)
- fix terraform license change
- fix infinite recursion related to mdadm.conf

flake.nix

@@ -88,7 +88,8 @@
       };
     } // flake-utils.lib.eachDefaultSystem (system:
       let
-        pkgs = serokell-nix.lib.pkgsWith nixpkgs.legacyPackages.${system} allOverlays;
+        pkgsAllowUnfree = import nixpkgs { inherit system; config.allowUnfree = true;};
+        pkgs = serokell-nix.lib.pkgsWith pkgsAllowUnfree allOverlays;
 
         tfConfigAst = terranix.lib.terranixConfigurationAst {
           inherit system pkgs;

servers/alzirr/platform.nix

@@ -44,12 +44,11 @@
   # machines irrespective of host names.
   # We do not worry about plugging disks into the wrong machine because
   # we will never exchange disks between machines.
-  environment.etc."mdadm.conf".text = ''
-    HOMEHOST hetzner
-  '';
   # The RAIDs are assembled in stage1, so we need to make the config
   # available there.
-  boot.swraid.mdadmConf = config.environment.etc."mdadm.conf".text;
+  boot.swraid.mdadmConf = ''
+    HOMEHOST hetzner
+  '';
 
   # Default mdmonitor service does not work, fix it by directing events to the log.
   # See https://github.com/NixOS/nixpkgs/issues/72394