use the new crypto/tls QUIC Transport, drop support for Go 1.19

[marten-seemann]

Fixes #2727. Fixes #3757.

Unfortunately, golang/go#60506 didn't make it into the rc, and it's unclear if it'll make it into the final release. We'll have to call DecryptSessionTicket as a workaround, which cause the initilization of the session ticket keys.

I've updated the Go 1.20 qtls fork to implement a similar API as the new crypto/tls QUIC API, but to still use the same mechanism to encode application data into the session ticket. We can backport this to the Go 1.19 fork.

[codecov]

Codecov Report

Merging #3860 (512c06e) into master (21388c8) will decrease coverage by 0.01%.
The diff coverage is 70.02%.

❗ Current head 512c06e differs from pull request most recent head 66dbe5d. Consider uploading reports for the commit 66dbe5d to get more accurate results

@@            Coverage Diff             @@
##           master    #3860      +/-   ##
==========================================
- Coverage   83.18%   83.17%   -0.01%     
==========================================
  Files         145      146       +1     
  Lines       14587    14725     +138     
==========================================
+ Hits        12134    12247     +113     
- Misses       1974     1987      +13     
- Partials      479      491      +12     

Impacted Files	Coverage Δ
interface.go	0.00% <ø> (ø)
internal/handshake/session_ticket.go	100.00% <ø> (ø)
connection.go	72.40% <30.00%> (-0.34%)	⬇️
internal/qtls/go120.go	28.99% <47.62%> (+9.42%)	⬆️
transport.go	68.67% <50.00%> (+5.80%)	⬆️
internal/qtls/go121.go	57.45% <57.45%> (ø)
internal/qtls/client_session_cache.go	58.54% <58.54%> (ø)
crypto_stream_manager.go	80.43% <72.73%> (-9.57%)	⬇️
internal/qtls/cipher_suite_go121.go	85.19% <85.19%> (ø)
internal/handshake/crypto_setup.go	56.29% <88.20%> (-5.73%)	⬇️
... and 9 more

... and 7 files with indirect coverage changes