build: Bump nixpkgs and poetry2nix to recent unstable

Need to keep using Python 3.11 for now because of an upstream issue
<sat-utils/sat-search#135>.

index.markdown

@@ -4,5 +4,4 @@ layout: default
 
 -   [Radar Flood Water Extraction](https://github.com/linz/emergency-management-tools/tree/master/flooding/sentinel1_water_extraction)
 -   [Optical Flood Water Extraction](https://github.com/linz/emergency-management-tools/tree/master/flooding/sentinel2_water_extraction)
--   [Convert date/time from machine-readable to
-    human-readable]({{ 'machine-readable-to-human-readable-date-time/' | relative_url }})
+-   [Convert date/time from machine-readable to human-readable]({{ 'machine-readable-to-human-readable-date-time/' | relative_url }})

nixpkgs.nix

@@ -1,6 +1,7 @@
 import (
   builtins.fetchTarball {
-    url = "https://github.com/nixos/nixpkgs/archive/2057814051972fa1453ddfb0d98badbea9b83c06.tar.gz";
-    sha256 = "1a8jafyawg8mysv787q0cwghkza9kahbbniism7v2rcxas89b575";
+    name = "nixos-unstable-2024-06-16";
+    url = "https://github.com/nixos/nixpkgs/archive/b60ebf54c15553b393d144357375ea956f89e9a9.tar.gz";
+    sha256 = "0rcshmy2lnw9i8y9jdp4dk1j6iacfmc0hlpslv1zr0idiiqpmsm6";
   }
 ) {}

poetry2nix.nix

@@ -1,8 +1,9 @@
 {pkgs}:
 import (
   builtins.fetchTarball {
-    url = "https://github.com/nix-community/poetry2nix/archive/291a863e866972f356967d0a270b259f46bf987f.tar.gz";
-    sha256 = "1mzsvkbxh5c1j82gsghfa3gc0amnsajygbw7n6wxn9mg48j5y45x";
+    name = "poetry2nix-2024.8.2346599";
+    url = "https://github.com/nix-community/poetry2nix/archive/7619e43c2b48c29e24b88a415256f09df96ec276.tar.gz";
+    sha256 = "10nf9213h7vkzrqhrgk88r5sd2rq19cvdpnn59f65ifak790sgc0";
   }
 ) {
   inherit pkgs;

python.nix

@@ -1,2 +1,2 @@
 {pkgs}:
-pkgs.python3
+pkgs.python311