fix(datasource/galaxy): loosen schema (#25712)

lib/modules/datasource/galaxy/index.ts

@@ -73,12 +73,14 @@ export class GalaxyDatasource extends Datasource {
     }
 
     result.releases = versions.map(
-      (version: { name: string; created: string }) => {
+      (version: { name: string; created?: string }) => {
         const release: Release = {
           version: version.name,
-          releaseTimestamp: version.created,
         };
 
+        if (is.nonEmptyString(version.created)) {
+          release.releaseTimestamp = version.created;
+        }
         return release;
       },
     );

lib/modules/datasource/galaxy/schema.ts

@@ -8,7 +8,7 @@ export const GalaxyV1 = z.object({
         versions: z.array(
           z.object({
             name: z.string(),
-            created: z.string(),
+            created: z.string().optional(),
           }),
         ),
       }),