chore: bump nixpkgs and MSRV

README.md

@@ -17,7 +17,7 @@ Note: `january`, `autumn`, and `vortex` are yet to be moved into this monorepo.
 
 ## Minimum Supported Rust Version
 
-Rust 1.70 or higher.
+Rust 1.76 or higher.
 
 ## Development Guide
 

default.nix

@@ -1,6 +1,6 @@
 let
-  # Pinned nixpkgs, deterministic. Last updated: 11-08-2023.
-  pkgs = import (fetchTarball("https://github.com/NixOS/nixpkgs/archive/bb9707ef2ea4a5b749b362d5cf81ada3ded2c53f.tar.gz")) {};
+  # Pinned nixpkgs, deterministic. Last updated: 28-07-2024.
+  pkgs = import (fetchTarball("https://github.com/NixOS/nixpkgs/archive/9b34ca580417e1ebc56c4df57d8b387dad686665.tar.gz")) {};
 
   # Rolling updates, not deterministic.
   # pkgs = import (fetchTarball("channel:nixpkgs-unstable")) {};
@@ -29,7 +29,7 @@ in pkgs.mkShell {
     pkgs.rustc
     pkgs.clippy
     pkgs.rustfmt
-    pkgs.pkgconfig
+    pkgs.pkg-config
     pkgs.openssl.dev
 
     # mdbook