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Extend timeout to deal with pkg/master flake.

**What this PR does / why we need it**:

Workaround for bug kubernetes#59450.
Related to PR kubernetes#59441.
Locally test runs about 90 seconds.
However on the bazel-test CI the test frequently runs over 5 minutes.
Extending the timeout as a work-around to ease the rerun problem.
As @mikedanese notes :-

The Validate calls to the vendored go-openapi library are which make the test slow:
https://github.com/kubernetes/kubernetes/blob/master/pkg/master/master_openapi_test.go#L91
We should probably do more perf and send a patch to upstream.

**Special notes for your reviewer**:
This is intended as a work-around to unblock other PRs while someone investigates the timeout issue.

**Release note**:
```release-note
NONE
```