test/kokoro: increase PSM Security test timeout to 4h (v1.52.x backport) #6196
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Backport of #6193 to v1.52.x.
The total time PSM Security takes to run was getting close to 3h lately. About ~4% of weekly test runs exceed the 3h limit. Adding an extra hour to allow for a larger margin of error.
ref b/259690410
RELEASE NOTES: N/A