update to go1.18 (backport #1177)

[mergify]

This is an automatic backport of pull request #1177 done by Mergify.
Cherry-pick of eed3294 has failed:

On branch mergify/bp/v7.x/pr-1177
Your branch is up to date with 'origin/v7.x'.

You are currently cherry-picking commit eed3294.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   .github/workflows/build.yml
	modified:   .github/workflows/sim.yml
	modified:   CHANGELOG.md
	modified:   Dockerfile
	modified:   go.mod

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .github/workflows/test.yml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

---

Mergify commands and options

More conditions and actions can be found in the documentation.

You can also trigger Mergify actions by commenting on this pull request:

• @Mergifyio refresh will re-evaluate the rules
• @Mergifyio rebase will rebase this PR on its base branch
• @Mergifyio update will merge the base branch into this PR
• @Mergifyio backport <destination> will backport this PR on <destination> branch

Additionally, on Mergify dashboard you can:

• look at your merge queues
• generate the Mergify configuration with the config editor.

Finally, you can contact us on https://mergify.com

[ValarDragon]

RIP the linter changed across the upgrade, so a bunch of lints to fix

[codecov-commenter]

Codecov Report

Merging #1194 (3021521) into v7.x (18d70da) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             v7.x    #1194   +/-   ##
=======================================
  Coverage   20.86%   20.86%           
=======================================
  Files         199      199           
  Lines       25416    25416           
=======================================
  Hits         5303     5303           
  Misses      19150    19150           
  Partials      963      963           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 18d70da...3021521. Read the comment docs.

[alexanderbez]

Yikes, there's a handful of linting errors. I presume linters were tweaked on main and not backported. Does this sound right @ValarDragon? Do you know what PR this was so we can maybe backport it?

[ValarDragon]

It was version incompatibility issues between the golangci-lint version and go1.18, updating the golangci-lint to match the version in main fixes this!