Upgrade to Go 1.24 and golangci-lint v2

[caxu-rh]

• Upgrade to golangci-lint v2
  • Migrate configuration file
  • Bump version used in Makefile
  • Address lint issues, remove unused nolint directives
• Upgrade to Go 1.24
  • Bump version in go.mod
  • Bump base image version in Dockerfile

Go module dependencies will be automatically handled by Dependabot in one or more follow-up PRs.

[caxu-rh]

     - check: v1.1/images-are-certified
      type: Mandatory
      outcome: FAIL
      reason: 'Failed to certify images : registry.access.redhat.com/rhscl/postgresql-10-rhel7:1-161 : bad response code 400 from pyxis request : https://catalog.redhat.com/api/containers/v1/repositories/registry/registry.access.redhat.com/repository/rhscl/postgresql-10-rhel7/images'

[mgoerens]

@caxu-rh To me that looks like an intermittent error, I've retried the pipeline but got another error:

Traceback (most recent call last):
  File "/home/runner/work/chart-verifier/chart-verifier/chart-verifier/ve1/bin/release-checker", line 8, in <module>
tarball_base_name=chart-verifier-1.13.12.tgz
    sys.exit(main())
  File "/home/runner/work/chart-verifier/chart-verifier/chart-verifier/ve1/lib/python3.9/site-packages/release/releasechecker.py", line 112, in main
    if check_if_only_version_file_is_modified(args.api_url):
  File "/home/runner/work/chart-verifier/chart-verifier/chart-verifier/ve1/lib/python3.9/site-packages/release/releasechecker.py", line 62, in check_if_only_version_file_is_modified
    filename = f["filename"]
TypeError: string indices must be integers
[INFO] Verifier tarball created : /home/runner/work/chart-verifier/chart-verifier/chart-verifier/chart-verifier-1.13.12.tgz.
PR_tarball_name=/home/runner/work/chart-verifier/chart-verifier/chart-verifier/chart-verifier-1.13.12.tgz
Error: Process completed with exit code 1.

I believe I have identified the issue (another intermittent issue, due to GitHub timeouts), and am working on a fix. (EDIT: see #513 )

I will now re-re-try the pipeline.

[mgoerens]

LGTM

[komish]

/lgtm