Bumping go.mod to v1.18

[psschwei]

Signed-off-by: Paul S. Schweigert [email protected]

Looks like I missed this in the last round of updates...

Release Note

Knative Serving requires go v1.18

/assign @dprotaso

[codecov]

Codecov Report

Merging #13169 (2851fd6) into main (0b694b0) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #13169      +/-   ##
==========================================
+ Coverage   86.69%   86.71%   +0.02%     
==========================================
  Files         196      196              
  Lines       14450    14450              
==========================================
+ Hits        12527    12530       +3     
+ Misses       1626     1624       -2     
+ Partials      297      296       -1     

Impacted Files	Coverage Δ
pkg/reconciler/revision/background.go	92.72% <0.00%> (+1.81%)	⬆️

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[dprotaso]

/lgtm
/approve

[knative-prow]

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