Bump github.com/gardener/gardener from 1.90.4 to 1.91.0

Bumps [github.com/gardener/gardener](https://github.com/gardener/gardener) from 1.90.4 to 1.91.0.
- [Release notes](https://github.com/gardener/gardener/releases)
- [Commits](gardener/gardener@v1.90.4...v1.91.0)

---
updated-dependencies:
- dependency-name: github.com/gardener/gardener
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -4,7 +4,7 @@ go 1.22.1
 
 require (
 	github.com/ahmetb/gen-crd-api-reference-docs v0.3.0
-	github.com/gardener/gardener v1.90.4
+	github.com/gardener/gardener v1.91.0
 	github.com/go-logr/logr v1.4.1
 	github.com/onsi/ginkgo/v2 v2.17.1
 	github.com/onsi/gomega v1.32.0
@@ -37,8 +37,9 @@ require (
 	github.com/fatih/color v1.16.0 // indirect
 	github.com/fluent/fluent-operator/v2 v2.7.0 // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/gardener/cert-management v0.12.1 // indirect
 	github.com/gardener/etcd-druid v0.22.0 // indirect
-	github.com/gardener/hvpa-controller/api v0.5.0 // indirect
+	github.com/gardener/hvpa-controller/api v0.15.0 // indirect
 	github.com/gardener/machine-controller-manager v0.52.0 // indirect
 	github.com/go-logr/zapr v1.3.0 // indirect
 	github.com/go-openapi/errors v0.20.4 // indirect
@@ -92,13 +93,13 @@ require (
 	github.com/xeipuuv/gojsonschema v1.2.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/zap v1.27.0 // indirect
-	golang.org/x/crypto v0.20.0 // indirect
-	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
+	golang.org/x/crypto v0.21.0 // indirect
+	golang.org/x/exp v0.0.0-20231110203233-9a3e6036ecaa // indirect
 	golang.org/x/mod v0.14.0 // indirect
 	golang.org/x/net v0.21.0 // indirect
-	golang.org/x/oauth2 v0.15.0 // indirect
-	golang.org/x/sys v0.17.0 // indirect
-	golang.org/x/term v0.17.0 // indirect
+	golang.org/x/oauth2 v0.16.0 // indirect
+	golang.org/x/sys v0.18.0 // indirect
+	golang.org/x/term v0.18.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
 	golang.org/x/time v0.5.0 // indirect
 	gomodules.xyz/jsonpatch/v2 v2.4.0 // indirect
@@ -109,18 +110,18 @@ require (
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	helm.sh/helm/v3 v3.14.2 // indirect
-	istio.io/api v1.19.7-0.20240110022508-68cf4097ffc5 // indirect
-	istio.io/client-go v1.19.7-0.20240110023605-ad5ce1f48b56 // indirect
-	k8s.io/apiextensions-apiserver v0.29.2 // indirect
+	helm.sh/helm/v3 v3.14.3 // indirect
+	istio.io/api v1.19.8 // indirect
+	istio.io/client-go v1.19.8 // indirect
+	k8s.io/apiextensions-apiserver v0.29.3 // indirect
 	k8s.io/autoscaler/vertical-pod-autoscaler v1.0.0 // indirect
 	k8s.io/gengo v0.0.0-20230829151522-9cce18d56c01 // indirect
 	k8s.io/klog v1.0.0 // indirect
 	k8s.io/klog/v2 v2.120.1 // indirect
-	k8s.io/kube-aggregator v0.29.2 // indirect
+	k8s.io/kube-aggregator v0.29.3 // indirect
 	k8s.io/kube-openapi v0.0.0-20231010175941-2dd684a91f00 // indirect
-	k8s.io/kubelet v0.29.2 // indirect
-	k8s.io/metrics v0.29.2 // indirect
+	k8s.io/kubelet v0.29.3 // indirect
+	k8s.io/metrics v0.29.3 // indirect
 	sigs.k8s.io/controller-runtime/tools/setup-envtest v0.0.0-20231015215740-bf15e44028f9 // indirect
 	sigs.k8s.io/controller-tools v0.14.0 // indirect
 	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect