workhorse: Update module gitlab.com/gitlab-org/gitaly/v14 to v15

This MR contains the following updates:

Package	Type	Update	Change
gitlab.com/gitlab-org/gitaly/v14	require	major	v14.10.0-rc1.0.20220426135705-ccfab390f7c3 -> v15.1.0

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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workhorse/go.mod

@@ -26,13 +26,14 @@ require (
 	github.com/sirupsen/logrus v1.8.1
 	github.com/smartystreets/goconvey v1.6.4
 	github.com/stretchr/testify v1.7.0
-	gitlab.com/gitlab-org/gitaly/v14 v14.10.0-rc1.0.20220426135705-ccfab390f7c3
+	gitlab.com/gitlab-org/gitaly/v14 v14.0.0-rc1
+	gitlab.com/gitlab-org/gitaly/v15 v15.1.0
 	gitlab.com/gitlab-org/golang-archive-zip v0.1.1
 	gitlab.com/gitlab-org/labkit v1.15.0
 	gocloud.dev v0.25.0
 	golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8
 	golang.org/x/lint v0.0.0-20210508222113-6edffad5e616
-	golang.org/x/net v0.0.0-20220401154927-543a649e0bdd
+	golang.org/x/net v0.0.0-20220531201128-c960675eff93
 	golang.org/x/tools v0.1.5
 	google.golang.org/grpc v1.45.0
 	google.golang.org/protobuf v1.28.0
@@ -101,13 +102,13 @@ require (
 	github.com/uber/jaeger-lib v2.4.1+incompatible // indirect
 	go.opencensus.io v0.23.0 // indirect
 	go.uber.org/atomic v1.9.0 // indirect
-	golang.org/x/crypto v0.0.0-20220331220935-ae2d96664a29 // indirect
+	golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e // indirect
 	golang.org/x/mod v0.5.0 // indirect
 	golang.org/x/oauth2 v0.0.0-20220309155454-6242fa91716a // indirect
-	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
-	golang.org/x/sys v0.0.0-20220330033206-e17cdc41300f // indirect
+	golang.org/x/sync v0.0.0-20220601150217-0de741cfad7f // indirect
+	golang.org/x/sys v0.0.0-20220614162138-6c1b26c55098 // indirect
 	golang.org/x/text v0.3.7 // indirect
-	golang.org/x/time v0.0.0-20220224211638-0e9765cccd65 // indirect
+	golang.org/x/time v0.0.0-20220609170525-579cf78fd858 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	google.golang.org/api v0.74.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect