Add json fixture for new Value type

Author: emdash-ie

modules/core/src/test/resources/versions-cache-value-with-first-seen.json

@@ -0,0 +1,8 @@
+{
+    "updatedAt": 10002,
+    "versions": [
+        { "version": "1.0.0", "firstSeen": 10000 },
+        { "version": "1.0.1", "firstSeen": 10001 }
+    ],
+    "maybeError": null
+}