nixpkgs: Update submodule to include libtiff fix

nh2 · nh2 · commit 526e1618bbbf · 2024-06-16T00:50:51.000+02:00
NixOS/nixpkgs#320105
diff --git a/nixpkgs b/nixpkgs
@@ -1 +1 @@
-Subproject commit 0a68da6ea0b3268e3b29e5b0651a60fc83a1c07f
+Subproject commit 1e91820a911edcbfed2498064b898d760741a7d9
diff --git a/nixpkgs.nix b/nixpkgs.nix
@@ -26,4 +26,4 @@ if builtins.getEnv "STATIC_HASKELL_NIX_CI_NIXPKGS_UNSTABLE_BUILD" == "1"
       then import ./nixpkgs {}
       # Pinned nixpkgs version; should be kept up-to-date with our submodule.
       # This is nixos-23.11 as of 2024-01-01, with minimal patches currently having open nixpkgs PR (see commits for PR links).
-      else import (fetchTarball https://github.com/nh2/nixpkgs/archive/942314d40590668d3975f431d23f928a741912cf.tar.gz) {}
+      else import (fetchTarball https://github.com/nh2/nixpkgs/archive/1e91820a911edcbfed2498064b898d760741a7d9.tar.gz) {}
