Renovate MRs for Go major version package upgrades were broken because they
only updated the go.mod file with the new package version, leaving the old
package path in place. This meant:

1. Import statements throughout the codebase were not updated
2. `go.mod` contained both old and new package paths
3. `golangci-lint` would run `go mod tidy` and find differences
4. CI would fail, making the MR unmergeable without manual intervention

Add `gomodUpdateImportPaths` to the `postUpdateOptions` configuration. This
enables Renovate to use a third-party tool
(`github.com/marwan-at-work/mod/cmd/mod`) to automatically migrate import paths
within application code during major Go package upgrades.

With this change, Renovate will now:

- Update the `go.mod` file with the new package version
- Automatically update all import statements to use the new package path
- Run `go mod tidy` to clean up the module file
- Potentially produce MRs that pass CI without manual code changes

This change only handles import path migrations. The following scenarios
still require manual intervention:

1. API breaking changes: If the upgraded package has breaking changes to the
   API used by the target repository (e.g., renamed functions, changed
   signatures), those changes must be made manually in the application code.

2. Behavior changes: If the package behavior changed in ways that affect
   application logic, manual updates may be needed.

3. Deprecated features: If the application uses deprecated features that
   were removed in the major version, manual refactoring is required.

However, for upgrades where the package API surface remains compatible
or only has additive changes, the MRs should now be fully mergeable
without human intervention.

fix(Renovate): enable automatic import path updates for Go major version upgrades

See merge request !1341

## [3.8.3](https://gitlab.com/gitlab-com/gl-infra/common-ci-tasks/-/compare/...) (2026-03-10)

### Fixes

* enable automatic import path updates for Go major version upgrades ([251e0fa1](251e0fa1))