Using outdated cached fuzzer repo.

[DonggeLiu]

Problem

FuzzBench uses a cached fuzzer repo instead of the latest one, which sometimes does not include the new commits required.

Proof of Error

https://github.com/google/fuzzbench/pull/1902#issuecomment-1737463393

Proposed solution

Removing this.

@jonathanmetzman Would this look good to you? Those two lines originated from here. Please let me know if I missed anything (e.g., side-effects of removing them, other preferred solutions), thanks : )