Update deps

[UnstoppableMango]

• Update deps
• Flake

[Copilot]

Pull request overview

This PR updates Go and Nix dependencies and aligns internal code with API changes in the github.com/unmango/go module and related tooling.

Changes:

• Replace usage of github.com/unmango/go/option with the new github.com/unmango/go/fopt helper in work and version option initialization code.
• Bump primary and indirect Go module dependencies (including github.com/unmango/go, Ginkgo/Gomega, google/go-github, golang.org/x/*, and others) and update the go directive in go.mod, with corresponding changes in go.sum.
• Refresh flake.lock to newer nixpkgs and treefmt-nix revisions.

Reviewed changes

Copilot reviewed 4 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pkg/work/work.go	Switches functional option application from option.ApplyAll to fopt.ApplyAll and updates the import to the new fopt package.
pkg/version/internal/options.go	Updates internal version option helpers to import github.com/unmango/go/fopt and use fopt.ApplyAll across Init/Print/Read/Write option initializers.
go.mod	Updates the go directive and bumps direct and indirect dependencies (testing, GitHub client, unmango libraries, golang.org/x/*, etc.) to newer versions.
go.sum	Regenerates checksums to match the new module versions referenced in go.mod.
flake.lock	Advances pinned nixpkgs and treefmt-nix revisions and hashes to keep the Nix flake environment in sync with updated tooling.

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