[hotfix][ci] Bump stale action to v11

[snuyanzin]

What is the purpose of the change

The PR to bump stale action because of old NodeJS
currently there is a warning about this https://github.com/apache/flink/actions/runs/30430754373

Brief change log

gha

Verifying this change

gha

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (yes)
• The public API, i.e., is any changed class annotated with @Public(Evolving): ( no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: ( no )
• The S3 file system connector: (yes)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable)

---

Was generative AI tooling used to co-author this PR?

• Yes (please specify the tool below)

[raminqaf]

LGTM

[flinkbot]

CI report:

• 45298e9 Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

• @flinkbot run azure re-run the last Azure build