Use forked version of gziphandler (#17852)

go.mod

@@ -7,7 +7,6 @@ require (
 	github.com/HdrHistogram/hdrhistogram-go v0.9.0 // indirect
 	github.com/Masterminds/semver/v3 v3.1.1
 	github.com/Masterminds/squirrel v1.5.0
-	github.com/NYTimes/gziphandler v1.1.1
 	github.com/PuerkitoBio/goquery v1.7.0 // indirect
 	github.com/RoaringBitmap/roaring v0.8.0 // indirect
 	github.com/advancedlogic/GoOse v0.0.0-20200830213114-1225d531e0ad // indirect
@@ -61,7 +60,6 @@ require (
 	github.com/jaytaylor/html2text v0.0.0-20200412013138-3577fbdbcff7
 	github.com/jmoiron/sqlx v1.3.4
 	github.com/jonboulle/clockwork v0.2.2
-	github.com/klauspost/compress v1.13.1 // indirect
 	github.com/klauspost/cpuid/v2 v2.0.6 // indirect
 	github.com/klauspost/pgzip v1.2.5 // indirect
 	github.com/kr/pretty v0.2.0 // indirect
@@ -72,6 +70,7 @@ require (
 	github.com/mattermost/go-i18n v1.11.0
 	github.com/mattermost/gorp v1.6.2-0.20210419141818-0904a6a388d3
 	github.com/mattermost/gosaml2 v0.3.3
+	github.com/mattermost/gziphandler v0.0.1
 	github.com/mattermost/ldap v0.0.0-20201202150706-ee0e6284187d
 	github.com/mattermost/logr v1.0.13
 	github.com/mattermost/rsc v0.0.0-20160330161541-bbaefb05eaa0
@@ -145,8 +144,6 @@ require (
 	willnorris.com/go/imageproxy v0.10.0
 )
 
-replace github.com/NYTimes/gziphandler v1.1.1 => github.com/agnivade/gziphandler v1.1.2-0.20200815170021-7481835cb745
-
 replace github.com/dyatlov/go-opengraph => github.com/agnivade/go-opengraph v0.0.0-20201221052033-34e69ee2a627
 
 // Hack to prevent the willf/bitset module from being upgraded to 1.2.0.