fix lint issue on structtag

[torcolvin]

The issue with the structtag was found with newer versions of staticcheck on the .golangci-strict.yml

• allow parallel runners by default, useful for working on multiple parts of a repo simultaneously, or one file, and then editing another

[Copilot]

Pull request overview

This PR resolves a structtag lint violation flagged by newer staticcheck and updates golangci-lint configuration to permit running multiple linters concurrently against the same repo checkout.

Changes:

• Fix invalid JSON struct tag on StartupConfig.DeprecatedConfig to satisfy structtag checks.
• Enable run.allow-parallel-runners in both standard and strict golangci-lint configurations.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
rest/config_startup.go	Fixes an invalid json struct tag that newer linters reject.
.golangci.yml	Enables parallel runners to reduce friction when running lint concurrently.
.golangci-strict.yml	Enables parallel runners for the strict lint configuration used in CI.

[torcolvin]

This ends up being a behavior change, previously the structtag was literally "-".

From https://pkg.go.dev/encoding/json

As a special case, if the field tag is "-", the field is always omitted. Note that a field with name "-" can still be generated using the tag "-,".

I highly doubt anyone knew about this and was relying on this behavior.