Revert httpcache integration

The httpcache transport is breaking authentication where no fix seems to
be implemented yet. I'd propose to revert the change for now to be able
to use authenticated requests in tools like
`k/release/cmd/release-notes`.

Refers to: google/go-github#1503,
gregjones/httpcache#104

Signed-off-by: Sascha Grunert <sgrunert@redhat.com>

github/github.go

@@ -27,8 +27,6 @@ import (
 	"strings"
 
 	"github.com/google/go-github/v45/github"
-	"github.com/gregjones/httpcache"
-	"github.com/gregjones/httpcache/diskcache"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/oauth2"
 
@@ -185,15 +183,6 @@ func NewWithToken(token string) (*GitHub, error) {
 			&oauth2.Token{AccessToken: token},
 		))
 	}
-	cacheDir, err := os.UserCacheDir()
-	if err != nil {
-		logrus.Infof("Unable to retrieve user cache dir: %v", err)
-		cacheDir = os.TempDir()
-	}
-	dir := filepath.Join(cacheDir, "kubernetes", "release-sdk", "github")
-	logrus.Debugf("Caching GitHub responses in %v", dir)
-	t := httpcache.NewTransport(diskcache.New(dir))
-	client.Transport = t.Transport
 
 	logrus.Debugf("Using %s GitHub client", state)
 	return &GitHub{

go.mod

@@ -8,7 +8,6 @@ require (
 	github.com/go-git/go-git/v5 v5.4.2
 	github.com/google/go-containerregistry v0.9.0
 	github.com/google/go-github/v45 v45.1.0
-	github.com/gregjones/httpcache v0.0.0-20190611155906-901d90724c79
 	github.com/magefile/mage v1.13.0
 	github.com/maxbrunsfeld/counterfeiter/v6 v6.5.0
 	github.com/sigstore/cosign v1.9.0
@@ -176,7 +175,6 @@ require (
 	github.com/opentracing/opentracing-go v1.2.0 // indirect
 	github.com/pelletier/go-toml v1.9.5 // indirect
 	github.com/pelletier/go-toml/v2 v2.0.1 // indirect
-	github.com/peterbourgon/diskv v2.0.1+incompatible // indirect
 	github.com/pierrec/lz4/v4 v4.1.2 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect

go.sum

@@ -1180,7 +1180,6 @@ github.com/gostaticanalysis/nilerr v0.1.1/go.mod h1:wZYb6YI5YAxxq0i1+VJbY0s2YONW
 github.com/gostaticanalysis/testutil v0.3.1-0.20210208050101-bfb5c8eec0e4/go.mod h1:D+FIZ+7OahH3ePw/izIEeH5I06eKs1IKI4Xr64/Am3M=
 github.com/gostaticanalysis/testutil v0.4.0/go.mod h1:bLIoPefWXrRi/ssLFWX1dx7Repi5x3CuviD3dgAZaBU=
 github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7/go.mod h1:FecbI9+v66THATjSRHfNgh1IVFe/9kFxbXtjV0ctIMA=
-github.com/gregjones/httpcache v0.0.0-20190611155906-901d90724c79 h1:+ngKgrYPPJrOjhax5N+uePQ0Fh1Z7PheYoUI/0nzkPA=
 github.com/gregjones/httpcache v0.0.0-20190611155906-901d90724c79/go.mod h1:FecbI9+v66THATjSRHfNgh1IVFe/9kFxbXtjV0ctIMA=
 github.com/grpc-ecosystem/go-grpc-middleware v1.0.0/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=
 github.com/grpc-ecosystem/go-grpc-middleware v1.0.1-0.20190118093823-f849b5445de4/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=
@@ -1699,7 +1698,6 @@ github.com/pelletier/go-toml v1.9.5/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCko
 github.com/pelletier/go-toml/v2 v2.0.1 h1:8e3L2cCQzLFi2CR4g7vGFuFxX7Jl1kKX8gW+iV0GUKU=
 github.com/pelletier/go-toml/v2 v2.0.1/go.mod h1:r9LEWfGN8R5k0VXJ+0BkIe7MYkRdwZOjgMj2KwnJFUo=
 github.com/performancecopilot/speed v3.0.0+incompatible/go.mod h1:/CLtqpZ5gBg1M9iaPbIdPPGyKcA8hKdoy6hAWba7Yac=
-github.com/peterbourgon/diskv v2.0.1+incompatible h1:UBdAOUP5p4RWqPBg048CAvpKN+vxiaj6gdUUzhl4XmI=
 github.com/peterbourgon/diskv v2.0.1+incompatible/go.mod h1:uqqh8zWWbv1HBMNONnaR/tNboyR3/BZd58JJSHlUSCU=
 github.com/peterh/liner v0.0.0-20170211195444-bf27d3ba8e1d/go.mod h1:xIteQHvHuaLYG9IFj6mSxM0fCKrs34IrEQUhOYuGPHc=
 github.com/phayes/checkstyle v0.0.0-20170904204023-bfd46e6a821d/go.mod h1:3OzsM7FXDQlpCiw2j81fOmAwQLnZnLGXVKUzeKQXIAw=