Downgrade bcrypt<4.0.0 for FireSim on AWS EC2 Centos7 + Install ninja by default for building CIRCT

[abejgonzalez]

Similar to https://github.com/firesim/firesim/pull/1805. Also, adds ninja in case users need to build CIRCT from source.

Related PRs / Issues:

Type of change:

• [ ] Bug fix
• [ ] New feature
• [ ] Other enhancement

Impact:

• [ ] RTL change
• [ ] Software change (RISC-V software)
• [ ] Build system change
• [ ] Other

Contributor Checklist:

• [ ] Did you set main as the base branch?
• [ ] Is this PR's title suitable for inclusion in the changelog and have you added a changelog:<topic> label?
• [ ] Did you state the type-of-change/impact?
• [ ] Did you delete any extraneous prints/debugging code?
• [ ] Did you mark the PR with a changelog: label?
• [ ] (If applicable) Did you update the conda .conda-lock.yml file if you updated the conda requirements file?
• [ ] (If applicable) Did you add documentation for the feature?
• [ ] (If applicable) Did you add a test demonstrating the PR?
• [ ] (If applicable) Did you mark the PR as Please Backport?

CI Help: Add the following labels to modify the CI for a set of features. Generally, a label added only affect subsequent changes to the PR (i.e. new commits, force pushing, closing/reopening). See ci:* for full list of labels:

• ci:fpga-deploy - Run FPGA-based E2E testing
• ci:local-fpga-buildbitstream-deploy - Build local FPGA bitstreams for platforms that are released
• ci:disable - Disable CI

[abejgonzalez]

Pending someone looking at the Ara build failures.