Drop support for Go 1.20

[MrAlias]

Resolve #4819

[codecov]

Codecov Report

Attention: Patch coverage is 32.65306% with 33 lines in your changes are missing coverage. Please review.

Project coverage is 82.9%. Comparing base (8fb28b5) to head (50907f6).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #4967   +/-   ##
=====================================
  Coverage   82.9%   82.9%           
=====================================
  Files        238     238           
  Lines      19167   19127   -40     
=====================================
- Hits       15891   15858   -33     
+ Misses      2984    2980    -4     
+ Partials     292     289    -3     

Files	Coverage Δ
log/keyvalue.go	97.8% <100.0%> (-0.2%)	⬇️
log/record.go	100.0% <100.0%> (ø)
sdk/trace/span.go	88.0% <100.0%> (+0.7%)	⬆️
...dk/metric/metricdata/metricdatatest/comparisons.go	92.1% <23.2%> (+0.2%)	⬆️

[XSAM]

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