increase reward task timeout

[ayrat555]

Motivation

in this PR (#2352) we started fetching rewards for address transactions async. The default timeout for tasks is 5s. So the task is failing if it can not be finished in 5 seconds

For example,
https://blockscout.com/poa/core/address/0xeca443e8e1ab29971a45a9c57a6a9875701698a5/transactions

Request: GET /address/0x548806f2215f44571431292f2314480c3f519044/transactions?type=JSON
** (exit) exited in: Task.await(%Task{owner: #PID<0.31196.125>, pid: #PID<0.31219.125>, ref: #Reference<0.2013515151.3130261506.163217>}, 5000)
    ** (EXIT) time out

Changelog

• increase reward task timeout

[coveralls]

Pull Request Test Coverage Report for Build 87caf976-85a3-42f2-8514-d278712c912f

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.09%) to 79.383%

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Totals
Change from base Build 1806de47-e9a9-4846-8359-5e17fec6f30e:	0.09%
Covered Lines:	5171
Relevant Lines:	6514

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💛 - Coveralls

[pasqu4le]

Nice catch, I had no idea there was this issue.

I only have the suggestion of using :timer

[vbaranov]

Except Pasquale's comment I have no objections.