nodejs 20 not supported (#62)

Author: naveensrinivasan

policies/unsupported-versions.yaml

@@ -69,6 +69,9 @@ nodejs:
   - version: "19"
     reason: "EOL since 2023-06-01 (non-LTS odd release)"
     eol_date: "2023-06-01"
+  - version: "20"
+    reason: "EOL since 2026-04-30 (LTS)"
+    eol_date: "2026-04-30"
   - version: "21"
     reason: "EOL since 2024-06-01 (non-LTS odd release)"
     eol_date: "2024-06-01"