Upgrade quic-go and enable HTTP/3 support for gRPC in buf curl

[sudorandom]

Upgrades quic-go in order to get trailer support with HTTP/3. This allows me to remove the check preventing using --http3 and --protocol=grpc

• Upgrades quic-go (replaces Bump github.com/quic-go/quic-go from 0.46.0 to 0.47.0 #3304)
• Allows users to specify --http3 and --protocol=grpc

Before:

buf curl --http3 --protocol=grpc \
    --data '{"sentence": "no"}' \
    https://demo.connectrpc.com/connectrpc.eliza.v1.ElizaService/Say

{
   "code": "internal",
   "message": "protocol error: no Grpc-Status trailer: unexpected EOF"
}

After:

buf curl --http3 --protocol=grpc \
    --data '{"sentence": "no"}' \
    https://demo.connectrpc.com/connectrpc.eliza.v1.ElizaService/Say

{
  "sentence": "How does that make you feel?"
}

[bufdev]

@sudorandom for some reason, some CI jobs didn't run, can you verify make passes locally? Nothing here suggests otherwise but wanted to check.

[sudorandom]

@bufdev go mod tidy -v apparently had the smallest of diffs (a white space change at the end). I checked the change in, and now make finishes correctly for me. Hopefully the CI should work as well.