Update go versions, remove go tip testing.

[aalexand]

Testing against the Go tip has not been useful, but it requires maintenance. It seems low ROI overall, so remove the go tip testing.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.35%. Comparing base (b9395ee) to head (1f94b19).

❗ There is a different number of reports uploaded between BASE (b9395ee) and HEAD (1f94b19). Click for more details.

HEAD has 803 uploads less than BASE

Flag	BASE (b9395ee)	HEAD (1f94b19)
	833	30

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1013      +/-   ##
==========================================
- Coverage   72.59%   67.35%   -5.24%     
==========================================
  Files          44       44              
  Lines        7793     7793              
==========================================
- Hits         5657     5249     -408     
  Misses       2112     2112              
- Partials       24      432     +408     

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