Replace old golang.org links with new go.dev

[alexandear]

The PR updates the links to https://go.dev across the code.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 66.66%. Comparing base (1216c9b) to head (ca0c398).
Report is 23 commits behind head on master.

Files with missing lines	Patch %	Lines
rules/implicit_aliasing.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1271      +/-   ##
==========================================
- Coverage   68.49%   66.66%   -1.84%     
==========================================
  Files          75       75              
  Lines        4384     5186     +802     
==========================================
+ Hits         3003     3457     +454     
- Misses       1233     1581     +348     
  Partials      148      148              

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