chore: bump nixpkgs to get bun 1.3.9

[albertov]

What does this PR do?

This PR bumps nixpkgs input in flake.lock to get bun 1.3.9 from nixpkgs. This fixes #13300

How did you verify your code works?

I ran nix run .# inside my clone and opencode built and started properly

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Found potential related PRs:

1. PR chore: Update nixpkgs to nixos-unstable-small for Bun compatibility #13292: "chore: Update nixpkgs to nixos-unstable-small for Bun compatibility"

   • chore: Update nixpkgs to nixos-unstable-small for Bun compatibility #13292
   • Likely related as it's addressing Bun version compatibility via nixpkgs

2. PR chore: update flake.lock for latest Bun version #13295: "chore: update flake.lock for latest Bun version"

   • chore: update flake.lock for latest Bun version #13295
   • Directly related - also updating flake.lock for Bun version management

These PRs may be addressing overlapping concerns around getting the correct Bun version (1.3.9) through nixpkgs updates. You should verify if they're duplicates or complementary fixes for issue #13300.

[MBanucu]

Yes. Let's push the awareness of opencode developers that they can't just ignore nix users.

[albertov]

OC downgraded back to bun 1.3.8 so this PR will be stale when it upgrades

[MBanucu]

#13302 (comment)
OC downgraded back to bun 1.3.8 so this PR will be stale when it upgrades

Am I missing something? For me it is still 1.3.9

opencode/package.json

Line 7 in 93eee0d

"packageManager": "bun@1.3.9",

[MBanucu]

Are opencode developers actually sleeping or am I missing something?

[albertov]

#13302 (comment)
OC downgraded back to bun 1.3.8 so this PR will be stale when it upgrades

Am I missing something? For me it is still 1.3.9

opencode/package.json

Line 7 in 93eee0d

"packageManager": "bun@1.3.9",

I was told on Discord that it was downgraded and later upgrade again. This patch or a similar one is still needed

[gigamonster256]

LGTM