chore(deps): bump the nix group with 2 updates (#23382)

Bumps the nix group with 2 updates: [devenv](https://github.com/cachix/devenv) and [nixpkgs](https://github.com/NixOS/nixpkgs).


Updates `devenv` from `c5ee672` to `1c57b5d`
- [Release notes](https://github.com/cachix/devenv/releases)
- [Commits](https://github.com/cachix/devenv/compare/c5ee672098ceb23c694fd89fdb1ff7478ee386fa...1c57b5dea0d400af97053fdd1a536fca17378f73)

Updates `nixpkgs` from `20b1ddd` to `44a9189`
- [Commits](https://github.com/NixOS/nixpkgs/compare/20b1ddd1aa5ace70c9468305030aa4f9ef79671b...44a91898084f46797b5fac650c7e8c9ac38c43d4)

---
updated-dependencies:
- dependency-name: devenv
  dependency-version: 1c57b5dea0d400af97053fdd1a536fca17378f73
  dependency-type: direct:production
  dependency-group: nix
- dependency-name: nixpkgs
  dependency-version: 44a91898084f46797b5fac650c7e8c9ac38c43d4
  dependency-type: direct:production
  dependency-group: nix
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

flake.lock

@@ -64,11 +64,11 @@
         "rust-overlay": "rust-overlay"
       },
       "locked": {
-        "lastModified": 1789928656,
-        "narHash": "sha256-D7RNclo2qbp+r3wR1ac5zR+rD6eTe5LUbdVtO/jJvuA=",
+        "lastModified": 1789991752,
+        "narHash": "sha256-SiH+H00IutELZBg7BBNo6r5DU6E+DG7DjrbeX5+QLa0=",
         "owner": "cachix",
         "repo": "devenv",
-        "rev": "c5ee672098ceb23c694fd89fdb1ff7478ee386fa",
+        "rev": "1c57b5dea0d400af97053fdd1a536fca17378f73",
         "type": "github"
       },
       "original": {
@@ -278,11 +278,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1789785513,
-        "narHash": "sha256-B44WL6h0XoLjJ41bUPJk0X5SDinLCII//6EcBLXKiJ0=",
+        "lastModified": 1789921291,
+        "narHash": "sha256-Ft/BRnIqw1MywFoXydKobjjWmDFgDdYtSpJliE8+yUw=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "20b1ddd1aa5ace70c9468305030aa4f9ef79671b",
+        "rev": "44a91898084f46797b5fac650c7e8c9ac38c43d4",
         "type": "github"
       },
       "original": {