remove go 1.18 support, bump minimum to go 1.19 and add testing for 1.20

[codeboten]

Fixes #7159

Signed-off-by: Alex Boten aboten@lightstep.com

[codecov]

Codecov Report

Base: 90.84% // Head: 90.84% // No change to project coverage 👍

Coverage data is based on head (40d019a) compared to base (e769012).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7151   +/-   ##
=======================================
  Coverage   90.84%   90.84%           
=======================================
  Files         293      293           
  Lines       14302    14302           
=======================================
  Hits        12993    12993           
  Misses       1041     1041           
  Partials      268      268           

Impacted Files	Coverage Δ
cmd/builder/internal/builder/main.go	59.57% <100.00%> (ø)
receiver/otlpreceiver/internal/logs/otlp.go	100.00% <0.00%> (ø)
receiver/otlpreceiver/internal/trace/otlp.go	100.00% <0.00%> (ø)
receiver/otlpreceiver/internal/metrics/otlp.go	100.00% <0.00%> (ø)

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