chore: Bump to 7.91.0 in main (#2785)

Signed-off-by: Mykhailo Kuznietsov <mkuznets@redhat.com>
Co-authored-by: Mykhailo Kuznietsov <mkuznets@redhat.com>

Author: che-bot

antora.yml

@@ -98,8 +98,8 @@ asciidoc:
     prod-upstream: Eclipse Che
     prod-url: "https://__<che_fqdn>__"
     prod-ver-major: "7"
-    prod-ver-patch: "7.90.0"
-    prod-ver: "7.90"
+    prod-ver-patch: "7.91.0"
+    prod-ver: "7.91"
     prod-workspace: che-ws
     prod: Eclipse Che
     prod2: Eclipse Che