fix: switch ld with lld on linux, fixes OOM

[giladchase]

We've recently taken to limit parallelism during builds due to Out Of Memory errors we got while running cargo test on 16-core machine, or 8-core machines running with -j16.

We hit OOM due to two reasons:

1. Commit fae5aed introduced llvm dependencies to the blockifier, which notably increased compilation and linking time.
2. Before fae5aed, we already had a quite memory-heavy linking stage, specifically ~7-8 ld instances running in parallel, each with ~2-3GB of memory, which was just enough not to hit OOM on most 16core machines.
   This was primarily due to a combination of factors:
   2.1 the blockifier being a large lib that needs a 2-3GB ld process
   to link in isolation.
   2.2 many crates have the blockifier as a dependency (transitively).
   2.3 ld naively parallelizes linking tasks.
   The combination of the above three issues caused a heavily parallelized environment to create many heavy linking jobs that shared no memory (blockifier linking was duplicated).

Switching lld handles parallelizing better and reduces memory stress from ~10 2-3GB ld linker instances post fae5aed, to ~2 1-2GB lld linker instances for the same tasks, which has a minimal memory impact.

Moreover, lld is already the default linker on rust nightly, and will eventually become the default on stable (see code comment for link to tracking issue).

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This change is 

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[github-actions]

Benchmark movements:
tree_computation_flow performance improved 😺
tree_computation_flow time: [33.810 ms 33.836 ms 33.868 ms]
change: [-5.5448% -4.1828% -3.0447%] (p = 0.00 < 0.05)
Performance has improved.
Found 6 outliers among 100 measurements (6.00%)
3 (3.00%) high mild
3 (3.00%) high severe

full_committer_flow performance improved 😺
full_committer_flow time: [29.462 ms 29.520 ms 29.594 ms]
change: [-1.5140% -1.3021% -1.0299%] (p = 0.00 < 0.05)
Performance has improved.
Found 5 outliers among 100 measurements (5.00%)
2 (2.00%) high mild
3 (3.00%) high severe

[giladchase]

Reviewable status: 0 of 3 files reviewed, all discussions resolved (waiting on @dorimedini-starkware and @elintul)

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.github/workflows/committer_ci.yml line 90 at r1 (raw file):

      # Benchmark the new code, splitting the benchmarks, and prepare the results for posting a comment.
      - uses: ./.github/actions/bootstrap

This calls dependencies.sh, which was missing (probably wasn't needed?).

Code quote:

      - uses: ./.github/actions/bootstrap

[dorimedini-starkware]

Reviewable status: 0 of 3 files reviewed, 1 unresolved discussion (waiting on @elintul and @giladchase)

a discussion (no related file):
please bump blockifier and committer on py side and open PR to pass hodor

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[dorimedini-starkware]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @elintul and @giladchase)

[elintul]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @giladchase)

[github-actions]

Benchmark movements:
full_committer_flow performance improved 😺
full_committer_flow time: [29.520 ms 29.571 ms 29.641 ms]
change: [-2.0274% -1.7945% -1.5358%] (p = 0.00 < 0.05)
Performance has improved.
Found 2 outliers among 100 measurements (2.00%)
1 (1.00%) high mild
1 (1.00%) high severe

[elintul]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @giladchase)

[dorimedini-starkware]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @giladchase)

[giladchase]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @giladchase)

a discussion (no related file):

Previously, dorimedini-starkware wrote…

please bump blockifier and committer on py side and open PR to pass hodor

Done, python is only failing on a flaky test which isn't a blocker.

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