[chore]: Bump github.com/gin-contrib/gzip from 1.0.1 to 1.1.0 (#3639)

Bumps [github.com/gin-contrib/gzip](https://github.com/gin-contrib/gzip) from 1.0.1 to 1.1.0.
- [Release notes](https://github.com/gin-contrib/gzip/releases)
- [Changelog](https://github.com/gin-contrib/gzip/blob/master/.goreleaser.yaml)
- [Commits](https://github.com/gin-contrib/gzip/compare/v1.0.1...v1.1.0)

---
updated-dependencies:
- dependency-name: github.com/gin-contrib/gzip
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

vendor/github.com/gin-contrib/gzip/README.md

@@ -4,7 +4,6 @@
 [![codecov](https://codecov.io/gh/gin-contrib/gzip/branch/master/graph/badge.svg)](https://codecov.io/gh/gin-contrib/gzip)
 [![Go Report Card](https://goreportcard.com/badge/github.com/gin-contrib/gzip)](https://goreportcard.com/report/github.com/gin-contrib/gzip)
 [![GoDoc](https://godoc.org/github.com/gin-contrib/gzip?status.svg)](https://godoc.org/github.com/gin-contrib/gzip)
-[![Join the chat at https://gitter.im/gin-gonic/gin](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/gin-gonic/gin)
 
 Gin middleware to enable `GZIP` support.
 

vendor/github.com/gin-contrib/gzip/handler.go

@@ -3,7 +3,7 @@ package gzip
 import (
 	"compress/gzip"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"path/filepath"
 	"strings"
@@ -22,7 +22,7 @@ func newGzipHandler(level int, options ...Option) *gzipHandler {
 		Options: DefaultOptions,
 		gzPool: sync.Pool{
 			New: func() interface{} {
-				gz, err := gzip.NewWriterLevel(ioutil.Discard, level)
+				gz, err := gzip.NewWriterLevel(io.Discard, level)
 				if err != nil {
 					panic(err)
 				}
@@ -47,13 +47,17 @@ func (g *gzipHandler) Handle(c *gin.Context) {
 
 	gz := g.gzPool.Get().(*gzip.Writer)
 	defer g.gzPool.Put(gz)
-	defer gz.Reset(ioutil.Discard)
+	defer gz.Reset(io.Discard)
 	gz.Reset(c.Writer)
 
 	c.Header("Content-Encoding", "gzip")
 	c.Header("Vary", "Accept-Encoding")
 	c.Writer = &gzipWriter{c.Writer, gz}
 	defer func() {
+		if c.Writer.Size() < 0 {
+			// do not write gzip footer when nothing is written to the response body
+			gz.Reset(io.Discard)
+		}
 		gz.Close()
 		c.Header("Content-Length", fmt.Sprint(c.Writer.Size()))
 	}()

vendor/github.com/gin-contrib/gzip/options.go

@@ -52,12 +52,12 @@ func WithDecompressFn(decompressFn func(c *gin.Context)) Option {
 }
 
 // Using map for better lookup performance
-type ExcludedExtensions map[string]bool
+type ExcludedExtensions map[string]struct{}
 
 func NewExcludedExtensions(extensions []string) ExcludedExtensions {
 	res := make(ExcludedExtensions)
 	for _, e := range extensions {
-		res[e] = true
+		res[e] = struct{}{}
 	}
 	return res
 }