drop toolchain directive

[dprotaso]

I missed that we bumped some non-dependency properties in the go.mod file in #2964

We shouldn't need to specify the toolchain directive - this oddly this breaks our go-licenses tool.

Bumping go version to v1.21 should be fine

see failure: knative-extensions/net-http01#593

/assign @izabelacg @ReToCode @skonto

[dprotaso]

client failures are expected - k8s client-go had breaking changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4fba530) 81.80% compared to head (d817856) 81.80%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2966   +/-   ##
=======================================
  Coverage   81.80%   81.80%           
=======================================
  Files         167      167           
  Lines       10231    10231           
=======================================
  Hits         8369     8369           
  Misses       1614     1614           
  Partials      248      248           

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[ReToCode]

/lgtm
/approve

We really need to remove that licence-tool. go xxx will always re-introduce that directive when the version changes.

[knative-prow]

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