Update DefaultTimeout to 5h

[yhan219]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

Special notes for reviewers:

When downloading offline, it often timed out. Now it is set to 2 hours. Although it is already very long, the time is still not enough if you rely on all the downloads, so it will be extended to 5 hours.

Does this PR introduced a user-facing change?

DefaultTimeout 2h->5h

Additional documentation, usage docs, etc.:

[kubesphere-prow]

Welcome @yhan219! It looks like this is your first PR to kubesphere/kubekey 🎉

[redscholar]

@yhan219 you can fix DCO check by run command in your branch

git commit -s --no-edit --amend
git push -f

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[redscholar]

/approve
/lgtm

[kubesphere-prow]

LGTM label has been added.

Git tree hash: 8994c2cecaca25a2931e9120b58fd994cc638bc0

[kubesphere-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: redscholar, yhan219

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[pixiake]

@all-contributors please add @yhan219 for code

[allcontributors]

@pixiake

I've put up a pull request to add @yhan219! 🎉