Consitently switch to stretchr/testify

We were using stretchr/testify and test-go/testify inconsitently and
sometimes mixed in the same tests. This can cause very strange issue,
e.g when using things like mock.MatchedBy().

This moves all our code to stretchr/testify, which seems to be far
more active and maintained then test-go/testify.

services/graph/pkg/service/v0/drives_test.go

@@ -7,7 +7,7 @@ import (
 	"github.com/CiscoM31/godata"
 	libregraph "github.com/owncloud/libre-graph-api-go"
 	"github.com/stretchr/testify/assert"
-	"github.com/test-go/testify/require"
+	"github.com/stretchr/testify/require"
 )
 
 type sortTest struct {

services/graph/pkg/service/v0/educationclasses_test.go

@@ -27,7 +27,7 @@ import (
 	identitymocks "github.com/owncloud/ocis/v2/services/graph/pkg/identity/mocks"
 	service "github.com/owncloud/ocis/v2/services/graph/pkg/service/v0"
 	"github.com/owncloud/ocis/v2/services/graph/pkg/service/v0/errorcode"
-	"github.com/test-go/testify/mock"
+	"github.com/stretchr/testify/mock"
 	"google.golang.org/grpc"
 )
 

services/graph/pkg/service/v0/educationschools_test.go

@@ -17,7 +17,7 @@ import (
 	"github.com/go-chi/chi/v5"
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
-	"github.com/test-go/testify/mock"
+	"github.com/stretchr/testify/mock"
 	"google.golang.org/grpc"
 
 	libregraph "github.com/owncloud/libre-graph-api-go"

services/graph/pkg/service/v0/groups_test.go

@@ -26,7 +26,7 @@ import (
 	identitymocks "github.com/owncloud/ocis/v2/services/graph/pkg/identity/mocks"
 	service "github.com/owncloud/ocis/v2/services/graph/pkg/service/v0"
 	"github.com/owncloud/ocis/v2/services/graph/pkg/service/v0/errorcode"
-	"github.com/test-go/testify/mock"
+	"github.com/stretchr/testify/mock"
 	"google.golang.org/grpc"
 )