feat(gin): support http3 using quic-go/quic-go (#3210)

* experimental support http3

* remove go1.14 and go1.15

* update quic-go package path

* only support go1.19+

* remove go19 support

* update gomod

* chore: refine CI configuration and dependencies

- Remove dynamic Go versioning in favor of pinning to major version `1`
- Update linter version from `v1.56.2` to `v1.58.1` in GitHub Actions workflow

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* chore: refactor CI workflow and improve tests

- Update the golangci-lint-action version from `v5` to `v6` in the GitHub workflow configuration

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* chore: update dependencies and CI configurations

- Update Go version requirement from `1.20` to `1.21` in `go.mod`

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* style: refactor codebase and update tests

- Add an empty line in the import section of `gin.go`

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* chore: enhance code quality and consistency

- Add `gin.go` to the list of files with specific linters in `.golangci.yml`, applying the `gci` linter.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

---------

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Co-authored-by: Bo-Yi Wu <appleboy.tw@gmail.com>

go.mod

@@ -1,6 +1,6 @@
 module github.com/gin-gonic/gin
 
-go 1.20
+go 1.21
 
 require (
 	github.com/bytedance/sonic v1.11.6
@@ -10,6 +10,7 @@ require (
 	github.com/json-iterator/go v1.1.12
 	github.com/mattn/go-isatty v0.0.20
 	github.com/pelletier/go-toml/v2 v2.2.2
+	github.com/quic-go/quic-go v0.43.1
 	github.com/stretchr/testify v1.9.0
 	github.com/ugorji/go/codec v1.2.12
 	golang.org/x/net v0.25.0
@@ -25,14 +26,23 @@ require (
 	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
-	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
+	github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
+	github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 // indirect
+	github.com/klauspost/cpuid/v2 v2.0.9 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/onsi/ginkgo/v2 v2.9.5 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/quic-go/qpack v0.4.0 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
-	golang.org/x/arch v0.8.0 // indirect
+	go.uber.org/mock v0.4.0 // indirect
+	golang.org/x/arch v0.0.0-20210923205945-b76863e36670 // indirect
 	golang.org/x/crypto v0.23.0 // indirect
+	golang.org/x/exp v0.0.0-20221205204356-47842c84f3db // indirect
+	golang.org/x/mod v0.11.0 // indirect
 	golang.org/x/sys v0.20.0 // indirect
 	golang.org/x/text v0.15.0 // indirect
+	golang.org/x/tools v0.9.1 // indirect
 )