chore: bump versions of aws-lc and aws-lc-fips

[dougch]

Resolved issues:

Partial for #4710

Description of changes:

We're pinning the versions of aws-lc and aws-lc-fips in CI, nix and our docker containers.

Call-outs:

• Because the flake is updated, the nix CI jobs are actually testing the new version of aws-lc
• This change won't make it into the regular CI jobs until the custom CodeBuild Docker containers are rebuilt (quick followup to this PR).
• The s2n_mem_usage_test was failing with 50KB/connection when awslc was built with musl; bumping to 51 resolves this in ad-hoc testing.

Testing:

How is this change tested: locally, unit tests pass

Is this a refactor change? If so, how have you proved that the intended behavior hasn't changed?

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[jmayclin]

Is there any neat way to pin to the latest release? Might be nice to shift to in the future.

[dougch]

re: the mem usage change, here are the exact numbers with musl from my debug run:

maxAllowedMemDiff: 110592000    
minAllowedMemDiff: 82944000      
handshake_diff: 110608384

https://github.com/aws/s2n-tls/blob/main/tests/unit/s2n_mem_usage_test.c#L277