fix: update GitHub owner in seedDummyProject function

- Changed the GitHub owner from "mantrakp04" to "hexcalve" in the seedDummyProject function to reflect the correct repository ownership.

This update ensures that the dummy data seeding process points to the appropriate GitHub account.

apps/backend/src/lib/seed-dummy-data.ts

@@ -2174,7 +2174,7 @@ export async function seedDummyProject(options: SeedDummyProjectOptions): Promis
       branchId: DEFAULT_BRANCH_ID,
       source: {
         type: "pushed-from-github",
-        owner: "mantrakp04",
+        owner: "hexcalve",
         repo: "config-test",
         branch: "main",
         commit_hash: "abc123def456789",