ci: update golangci-lint to v2.1.6

[austinvazquez]

This change updates golangci-lint to v2.1.6.

For the configuration updates, I ran golangci-lint migrate and added back a few linters that had been removed by default.

[austinvazquez]

Needs #6

[Copilot]

Pull Request Overview

This PR upgrades the project’s golangci-lint version to v2.1.6 and updates both the lint configuration file and CI workflow to match the new release.

• Migrate .golangci.yml to v2.1.6 format, re-enable select linters, and add new exclusions and formatters sections
• Bump the GitHub Actions step to install golangci-lint v2.1.6 and update the action reference accordingly

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.golangci.yml	Migrated config to v2 schema, updated enabled linters, added exclusions and formatting config
.github/workflows/ci.yml	Changed action to golangci-lint-action@v8 and set version: v2.1.6

Comments suppressed due to low confidence (3)

.github/workflows/ci.yml:41

• The GitHub Action reference golangci/golangci-lint-action@v8 may not exist; please verify the supported major version (for example, v6 or v4) and update the tag accordingly.

-      - uses: golangci/golangci-lint-action@v8

.golangci.yml:17

• Consider reintroducing a run: timeout: 5m setting in the root of this config so that local golangci-lint runs use the same timeout without relying solely on the CI flags.

exclusions:

.golangci.yml:47

• Indentation for the - test entry under formatters.exclusions.paths is inconsistent with the other path entries and may cause a YAML parse error; align it with the rest.

      - test