fuzz: Bump timeout in test_runner to accomodate for slow arm64 CPUs
fuzz: Bump timeout in test_runner to accomodate for slow arm64 CPUs

Summary:
Backport of core [[https://github.com/bitcoin/bitcoin/pull/17470 | PR17470]].

Only this commit is relevant:
https://github.com/bitcoin/bitcoin/pull/17470/commits/fa2ec9f4518c1da3ab3592537c6cd204693a6069

Test Plan:
  ninja bitcoin-fuzzers
  ./test/fuzz/test_runner.py <path_to_corpus>

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D8139

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