search.elasticsearch: Increase request timeout

The default (10s) is not enough on storage0.

Related to [1]

• [1] https://sentry.softwareheritage.org/share/issue/3590816ce1394d35b3bb669117c3fe13/

Not to be merged as is, just to mention the current shortcomings on webapp0 deployment.

Related to T2183

Test Plan

tox

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Migrated from D2581 (view on Phabricator)