fix: upgrade Nix flake Go version to 1.24 and fix lint errors

[flemzord]

Summary

• Bump Go version in Nix flake from 1.23 to 1.24 to match go.mod (Go 1.24.0 / toolchain go1.24.10). This was causing golangci-lint to fail with: the Go language version (go1.23) used to build golangci-lint is lower than the targeted Go version (1.24.10)
• Update flake.lock with latest nixpkgs and NUR inputs
• Fix staticcheck ST1001 lint errors in pkg/testserver/testserver.go by replacing dot imports with named imports

Test plan

• just pre-commit passes locally (generate, tidy, lint — 0 issues)
• CI pipeline passes on this PR

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6abbd09a-aea5-478e-be87-b957b23c5317

📥 Commits

Reviewing files that changed from the base of the PR and between 9fd1624 and 458d874.

⛔ Files ignored due to path filters (1)

• flake.lock is excluded by !**/*.lock, !**/*.lock

📒 Files selected for processing (2)

• flake.nix
• pkg/testserver/testserver.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/upgrade-go-1.24-nix-flake

📝 Coding Plan

• Generate coding plan for human review comments

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[NumaryBot]

LGTM