fix(handler): adapt to api-go beta.5 HttpHeaderValue.values string type

[rustatian]

Summary

api v6.0.0-beta.2 and api-go v6.0.0-beta.5 changed HttpHeaderValue.values from `repeated bytes` to `repeated string`. The http plugin's handler still uses `[]byte(...)` / `string(...)` casts that worked against the old proto but no longer compile against beta.5 (and trigger `unconvert` on the reverse-direction casts). This PR drops the now-incorrect casts so the plugin compiles against the new api-go.

Affected sites:

• `handler/convert.go`: drop `[]byte(...)` on append; collapse the inner loop in `convert()` into a variadic append; use `v` directly in `convertCookies()`.
• `handler/response.go`: drop `string(...)` on `pusher.Push`, on the trailer `SplitSeq` input, and on the per-value `Header.Add` — all three were bytes→string conversions under the old proto and are no-ops now.

Bumps `api-go/v6 v6.0.0-beta.4 → v6.0.0-beta.5` in the root module. `tests/` submodule unchanged (still on beta.4; tests-side migration tracked separately when http tests migrate to Connect-RPC).

This unblocks the status plugin's Connect-RPC migration, which transitively pulls http/v6 through its tests submodule.

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📥 Commits

Reviewing files that changed from the base of the PR and between 2ed0308 and 7d6bdd2.

⛔ Files ignored due to path filters (2)

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• go.work.sum is excluded by !**/*.sum

📒 Files selected for processing (3)

• go.mod
• handler/convert.go
• handler/response.go

✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch fix-api-go-beta-5-string-headers

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[Copilot]

Pull request overview

Updates the HTTP plugin handler code to compile against github.com/roadrunner-server/api-go/v6 v6.0.0-beta.5, which changed HttpHeaderValue.values from repeated bytes to repeated string, by removing now-invalid byte/string casts.

Changes:

• Remove obsolete []byte(...)/string(...) conversions when reading/writing proto header values.
• Simplify header conversion logic using variadic append for header value slices.
• Bump api-go/v6 dependency from v6.0.0-beta.4 to v6.0.0-beta.5 and update sums.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
handler/response.go	Drops no-op casts when pushing HTTP/2 resources, writing headers, and splitting trailer header values.
handler/convert.go	Adapts header/cookie conversion to append []string values directly into proto fields.
go.mod	Bumps github.com/roadrunner-server/api-go/v6 to v6.0.0-beta.5.
go.sum	Updates checksums for api-go/v6 version bump.
go.work.sum	Updates workspace sums after dependency resolution changes.

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