use go 1.18

[lionelvillard]

knative/pkg uses 1.18 features.

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lionelvillard

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[codecov]

Codecov Report

Merging #6470 (c298c66) into main (15dd7ca) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #6470      +/-   ##
==========================================
+ Coverage   82.15%   82.18%   +0.02%     
==========================================
  Files         235      235              
  Lines       11694    11712      +18     
==========================================
+ Hits         9607     9625      +18     
  Misses       1620     1620              
  Partials      467      467              

Impacted Files	Coverage Δ
pkg/broker/ingress/ingress_handler.go	77.33% <0.00%> (ø)
pkg/adapter/apiserver/events/events.go	94.11% <0.00%> (+0.30%)	⬆️
pkg/kncloudevents/message_receiver.go	93.50% <0.00%> (+1.31%)	⬆️

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[lionelvillard]

/test reconciler-tests_eventing_main

[matzew]

PKG PR is here: knative/pkg#2548

[lionelvillard]

/assign @matzew @pierDipi

[aslom]

/lgtm