Increase codegen timeout from 5 minutes to 6

[sbiscigl]

Description of changes:

Increases timeout of codegen that we hit in some clients in rare occasions.

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• [x] Did a review by yourself.
• [x] Added proper tests to cover this PR. (If tests are not applicable, explain.)
• [x] Checked if this PR is a breaking (APIs have been changed) change.
• [x] Checked if this PR will not introduce cross-platform inconsistent behavior.
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