[DoDiODev]

⚠️ Pre Checklist

Please complete ALL items in this checklist, and remove before submitting

• I have read through the Contributing Documentation.
• I have added relevant tests. (N/A: config-only change; the existing
  golangci-lint job covers it)
• I have added relevant documentation. (N/A)
• I will add labels to the PR, such as pr-type/bug-fix, pr-type/feature-development, etc.

Summary

backend/.golangci.yaml still carries a staticcheck exclusion that was
added in #9197 as a stopgap:

# aws-sdk-go v1 is end-of-support and its last release marks every
# package as deprecated. Tolerate that only for the kiro plugin until it
# is migrated to aws-sdk-go-v2; remove this rule afterwards.
- linters:
    - staticcheck
  path: plugins/kiro/
  text: 'SA1019: "?github.com/aws/aws-sdk-go/'

The migration it waits for landed in #9233. Since then the backend no
longer imports github.com/aws/aws-sdk-go (v1) anywhere, and go.mod /
go.sum only contain aws-sdk-go-v2 modules. The rule now matches nothing.

This PR removes it, as its own comment asks. If someone reintroduces a v1
import, golangci-lint reports it again instead of silently ignoring it.

Does this close any open issues?

N/A (follow-up to #9197 and #9233)

Screenshots

N/A

Other Information

• golangci-lint config verify passes, and make mock && make lint with
  golangci-lint v2.15.0 (the CI version) reports 0 issues.
• Fork CI on the same change (golangci-lint, unit-test, e2e on MySQL and
  PostgreSQL, config-ui, license header, Grafana check; 16/16 jobs green):
  https://github.com/DoDiODev/devlake/actions/runs/42363913171