try not requiring brew install gnu-getopt

[tersec]

It failed in https://github.com/status-im/nimbus-eth2/actions/runs/4047898159/jobs/6962479210

Run brew install gnu-getopt
==> Fetching gnu-getopt
==> Downloading https://ghcr.io/v2/homebrew/core/gnu-getopt/manifests/2.38.1
curl: (22) The requested URL returned error: [5](https://github.com/status-im/nimbus-eth2/actions/runs/4047898159/jobs/6962479210#step:7:6)00 
Error: gnu-getopt: Failed to download resource "gnu-getopt_bottle_manifest"
Download failed: https://ghcr.io/v2/homebrew/core/gnu-getopt/manifests/2.38.1
Error: Process completed with exit code 1.Run brew install gnu-getopt
==> Fetching gnu-getopt
==> Downloading https://ghcr.io/v2/homebrew/core/gnu-getopt/manifests/2.38.1
curl: (22) The requested URL returned error: [5](https://github.com/status-im/nimbus-eth2/actions/runs/4047898159/jobs/6962479210#step:7:6)00 
Error: gnu-getopt: Failed to download resource "gnu-getopt_bottle_manifest"
Download failed: https://ghcr.io/v2/homebrew/core/gnu-getopt/manifests/2.38.1
Error: Process completed with exit code 1.

A few places reference it:

• https://github.com/status-im/nimbus-eth2/blob/unstable/scripts/launch_local_testnet.sh
• https://github.com/status-im/nimbus-eth2/blob/unstable/scripts/make_packages.sh
• https://github.com/status-im/nimbus-eth2/blob/unstable/scripts/make_prometheus_config.sh
• https://github.com/status-im/nimbus-benchmarking/tree/dff3634b5d843f9b63425086f1b13245e26b6177

But none of these look necessary for an ordinary GitHub Actions CI build.

[github-actions]

Unit Test Results

         9 files  ±0    1 065 suites  ±0   30m 41s ⏱️ - 2m 57s
  3 547 tests ±0    3 310 ✔️ ±0  237 💤 ±0  0 ❌ ±0 
15 386 runs  ±0  15 121 ✔️ ±0  265 💤 ±0  0 ❌ ±0 

Results for commit 6b24316. ± Comparison against base commit b2f415c.