tests/vm: update openbsd image to 7.7

Update tests/vm/openbsd to release 7.7

Signed-off-by: Haseung Bong <hasueng@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20250615003249.310160-1-hasueng@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/vm/openbsd

@@ -22,8 +22,8 @@ class OpenBSDVM(basevm.BaseVM):
     name = "openbsd"
     arch = "x86_64"
 
-    link = "https://cdn.openbsd.org/pub/OpenBSD/7.6/amd64/install76.iso"
-    csum = "60cba8cb391b50bba8fa10fc768bd0529636f5345d82133c93e22c798d8e5269"
+    link = "https://cdn.openbsd.org/pub/OpenBSD/7.7/amd64/install77.iso"
+    csum = "da0106e39463f015524dca806f407c37a9bdd17e6dfffe533b06a2dd2edd8a27"
     size = "20G"
     pkgs = [
         # tools