drop support for Go 1.16 and 1.17

[marten-seemann]

This is in draft status until Go 1.19 is released.

[codecov]

Codecov Report

Merging #3482 (0d102b5) into master (d5efd34) will increase coverage by 0.05%.
The diff coverage is n/a.

❗ Current head 0d102b5 differs from pull request most recent head 34a403a. Consider uploading reports for the commit 34a403a to get more accurate results

@@            Coverage Diff             @@
##           master    #3482      +/-   ##
==========================================
+ Coverage   85.70%   85.75%   +0.05%     
==========================================
  Files         138      136       -2     
  Lines       10049    10025      -24     
==========================================
- Hits         8612     8596      -16     
+ Misses       1060     1051       -9     
- Partials      377      378       +1     

Impacted Files	Coverage Δ
internal/qtls/go118.go	58.33% <ø> (ø)
internal/qtls/go119.go	58.33% <ø> (ø)
sys_conn_df_linux.go	52.94% <ø> (ø)
sys_conn_df_windows.go	52.94% <ø> (ø)
sys_conn_oob.go	71.88% <ø> (ø)
sys_conn_windows.go	62.50% <ø> (ø)
qlog/qlog.go	90.36% <0.00%> (-0.71%)	⬇️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[marten-seemann]

Go 1.19 was released earlier today: https://go.dev/doc/go1.19. 🎉

@lucas-clemente, can you please review?

[marmeladema]

Support for Go 1.19 would be really helpful! Thank you for doing this.