Update Docker CI tags to 20251018-dbdf533 (flashinfer-ai#1945)

This PR updates the Docker CI image tags to the latest version:
`20251018-dbdf533`

Updated images:
- flashinfer/flashinfer-ci-cu126:20251018-dbdf533
- flashinfer/flashinfer-ci-cu128:20251018-dbdf533
- flashinfer/flashinfer-ci-cu129:20251018-dbdf533
- flashinfer/flashinfer-ci-cu130:20251018-dbdf533

Auto-generated by [release-ci-docker
workflow](https://github.com/flashinfer-ai/flashinfer/actions/runs/18613753975)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Chores**
* Updated Docker image tags and corrected repository path in CI
configuration.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: yzh119 <[email protected]>

Author: flashinfer-bot

ci/docker-tags.yml

@@ -1,4 +1,4 @@
-flashinfer/flashinfer-ci-cu126: 20251010-8d072e6
-flashinfer/flashinfer-ci-cu128: 20251010-8d072e6
-flashinfer/flashinfer-ci-cu129: 20251010-8d072e6
-flashinfer/flashinfer-ci-cu130: 20251010-8d072e6
+flashinfer/flashinfer-ci-cu126: 20251018-dbdf533
+flashinfer/flashinfer-ci-cu128: 20251018-dbdf533
+flashinfer/flashinfer-ci-cu129: 20251018-dbdf533
+flashinfer/flashinfer-ci-cu130: 20251018-dbdf533