fix: update OCI-image resource (#404)

Author: natalian98

charmcraft.yaml

@@ -20,7 +20,7 @@ resources:
   oci-image:
     type: oci-image
     description: OCI image for login-ui
-    upstream-source: ghcr.io/canonical/identity-platform-login-ui:v0.24.2
+    upstream-source: ghcr.io/canonical/identity-platform-login-ui:v0.26.0
 requires:
   kratos-info:
     interface: kratos_info