refactor(gateway): switch to xxhash/v2 (#285)

This is related to ipfs/kubo#9839.

boxo still depends on badger, which still requires xxhash/v1, 
but at least doesn't require it xxhash/v1 itself directly anymore.

examples/go.mod

@@ -26,7 +26,6 @@ require (
 	github.com/benbjohnson/clock v1.3.0 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cenkalti/backoff/v4 v4.2.0 // indirect
-	github.com/cespare/xxhash v1.1.0 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/containerd/cgroups v1.0.4 // indirect
 	github.com/coreos/go-systemd/v22 v22.5.0 // indirect

examples/go.sum

@@ -40,7 +40,6 @@ dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D
 git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/OneOfOne/xxhash v1.2.2 h1:KMrpdQIwFcEqXDklaen+P1axHaj9BSKzvpUUfnHldSE=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
@@ -63,7 +62,6 @@ github.com/buger/jsonparser v0.0.0-20181115193947-bf1c66bbce23/go.mod h1:bbYlZJ7
 github.com/cenkalti/backoff/v4 v4.2.0 h1:HN5dHm3WBOgndBH6E8V0q2jIYIR3s9yglV8k/+MN3u4=
 github.com/cenkalti/backoff/v4 v4.2.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cespare/xxhash/v2 v2.1.2/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=

gateway/assets/assets.go

@@ -13,7 +13,7 @@ import (
 	"path"
 	"strings"
 
-	"github.com/cespare/xxhash"
+	"github.com/cespare/xxhash/v2"
 
 	ipfspath "github.com/ipfs/boxo/path"
 )

gateway/handler_ipns_record.go

@@ -9,7 +9,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/cespare/xxhash"
+	"github.com/cespare/xxhash/v2"
 	"github.com/gogo/protobuf/proto"
 	ipath "github.com/ipfs/boxo/coreiface/path"
 	ipns_pb "github.com/ipfs/boxo/ipns/pb"

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/alecthomas/units v0.0.0-20210927113745-59d0afb8317a
 	github.com/benbjohnson/clock v1.3.0
 	github.com/cenkalti/backoff v2.2.1+incompatible
-	github.com/cespare/xxhash v1.1.0
+	github.com/cespare/xxhash/v2 v2.2.0
 	github.com/crackcomm/go-gitignore v0.0.0-20170627025303-887ab5e44cc3
 	github.com/cskr/pubsub v1.0.2
 	github.com/dustin/go-humanize v1.0.0
@@ -89,7 +89,7 @@ require (
 	github.com/AndreasBriese/bbloom v0.0.0-20190825152654-46b345b51c96 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cenkalti/backoff/v4 v4.2.0 // indirect
-	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/cespare/xxhash v1.1.0 // indirect
 	github.com/containerd/cgroups v1.0.4 // indirect
 	github.com/coreos/go-systemd/v22 v22.5.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect