Chore: 1216-update-go-python-and-dependencies

[reglim]

Fixes #1216

Requirements

All new code should be covered with tests, documentation should be updated. CI should pass.

Description of the Change

• Update Go to 1.21 in go.mod
• Remove matrix from CI, run Pipeline with 1.21
• Update setup-python in CI from v2 to v4
• Update CI to use Python 3.11 instead of 3.9
• Implement linting suggestions from updated version of golangci-lint to make pipeline pass
• Change expected output of IncludeRepo3Test, as the error message comes from go itself, which seems to have changed since version 1.16, see code below:

var repoTemplate *template.Template
repoTemplate, err = template.New("repo").Parse(repoTemplateString)
if err != nil {
    return fmt.Errorf("error parsing -repo template: %s", err)
}

Why this change is important?

The dependencies have not been updated for quite some time, and Go was on version 1.16 which is now two years old, so it was time for an upgrade.

Checklist

• [ ] unit-test added (if change is algorithm)
• [ ] functional test added/updated (if change is functional)
• [ ] man page updated (if applicable)
• [ ] bash completion updated (if applicable)
• [ ] documentation updated
• [x] author name in AUTHORS

[codecov[bot]]

Codecov Report

Merging #1217 (3ec5fca) into master (18203c6) will increase coverage by 0.01%. The diff coverage is 62.00%.

@@            Coverage Diff             @@
##           master    #1217      +/-   ##
==========================================
+ Coverage   65.95%   65.96%   +0.01%     
==========================================
  Files         143      143              
  Lines       16192    16188       -4     
==========================================
  Hits        10679    10679              
+ Misses       4760     4756       -4     
  Partials      753      753              

Files Changed	Coverage Δ
cmd/task_run.go	74.38% <0.00%> (+1.20%)	:arrow_up:
deb/changes.go	72.56% <0.00%> (ø)
deb/package_collection.go	67.61% <0.00%> (ø)
deb/remote.go	75.00% <ø> (ø)
main.go	0.00% <ø> (ø)
swift/public.go	57.69% <0.00%> (ø)
task/output.go	30.61% <0.00%> (ø)
utils/logging.go	0.00% <0.00%> (ø)
azure/public.go	65.25% <50.00%> (ø)
http/fake.go	61.97% <50.00%> (ø)
... and 15 more

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