Bump golang.org/x/net from 0.19.0 to 0.20.0

[dependabot[bot]]

Bumps golang.org/x/net from 0.19.0 to 0.20.0.

Commits

• cb5b10f go.mod: update golang.org/x dependencies
• 689bbc7 quic: deflake TestStreamsCreateConcurrency
• f12db26 internal/quic/cmd/interop: use wget --no-verbose in Dockerfile
• c136d0c quic: avoid panic when PTO expires and implicitly-created streams exist
• f9726a9 quic: fix packet size logging
• c337daf quic: enable qlog output in tests
• 2b416c3 quic/qlog: create log files with O_EXCL
• 1e59a7e quic/qlog: correctly write negative durations
• b0eb4d6 quic: compute pnum len from max ack received, not sent
• b952594 quic: fix data race in connection close
• Additional commits viewable in compare view

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