[patch] Add OCP 4.20 and normalize 4.18 support date

Add a new ocp_versions entry for OpenShift 4.20 with GA (Oct 21, 2025), standard support (May 3, 2026) and extended support (Oct 21, 2028). Also replace the ambiguous 4.18 standard_support string "GA of 4.19 + 3 Months" with the explicit date "February 25, 2025" to keep support dates consistent and machine-readable in src/mas/devops/data/ocp.yaml.

Author: prveenkumr

src/mas/devops/data/ocp.yaml

@@ -9,14 +9,19 @@
 # https://access.redhat.com/support/policy/updates/openshift/
 
 ocp_versions:
+  "4.20":
+    ga_date: "October 21, 2025"
+    standard_support: "May 3, 2026"
+    extended_support: "October 21, 2028"
+
   "4.19":
     ga_date: "June 17, 2025"
     standard_support: "December 17, 2026"
     extended_support: "N/A"
 
   "4.18":
     ga_date: "February 25, 2025"
-    standard_support: "GA of 4.19 + 3 Months"
+    standard_support: "February 25, 2025"
     extended_support: "August 25, 2026"
 
   "4.17":