config: bump cert-manager apiversion

v1alpha2 has been deprecated in favor of v1 (see [1]), scheduled to be
removed in v1.6.* (i.e., soon)

[1]:https://github.com/jetstack/cert-manager/blob/7eb301f74cf00e426da1f50b8a39249605463dfa/pkg/internal/apis/acme/validation/deprecation.go#L32-L42

Signed-off-by: Ciro S. Costa <ciroscosta@vmware.com>

config/webhook/webhook.yaml

@@ -92,7 +92,7 @@ webhooks:
 
 ---
 
-apiVersion: cert-manager.io/v1alpha2
+apiVersion: cert-manager.io/v1
 kind: Certificate
 metadata:
   name: cartographer-webhook
@@ -108,7 +108,7 @@ spec:
   secretName: cartographer-webhook
 ---
 
-apiVersion: cert-manager.io/v1alpha2
+apiVersion: cert-manager.io/v1
 kind: Issuer
 metadata:
   name: selfsigned-issuer