chore(deps): bump devenv from 91affc7 to 863b420 (#21811)

Bumps [devenv](https://github.com/cachix/devenv) from `91affc7` to `863b420`.
- [Release notes](https://github.com/cachix/devenv/releases)
- [Commits](https://github.com/cachix/devenv/compare/91affc7a7b6646852a0079678eadf12ac5029d9d...863b4204725efaeeb73811e376f928232b720646)

---
updated-dependencies:
- dependency-name: devenv
  dependency-version: 863b4204725efaeeb73811e376f928232b720646
  dependency-type: direct:production
...

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

flake.lock

@@ -163,11 +163,11 @@
         "rust-overlay": "rust-overlay"
       },
       "locked": {
-        "lastModified": 1776802132,
-        "narHash": "sha256-2yO2SGA7zVFYKe0qyJjdg7WHuMOKNwTQmigL7ydD8hI=",
+        "lastModified": 1776863933,
+        "narHash": "sha256-v9NoQFSln9n5zqVWUWUc9PajsMaGmga51HOAJqMx7Qw=",
         "owner": "cachix",
         "repo": "devenv",
-        "rev": "91affc7a7b6646852a0079678eadf12ac5029d9d",
+        "rev": "863b4204725efaeeb73811e376f928232b720646",
         "type": "github"
       },
       "original": {