CRT submodules update

aws-c-auth     v0.6.8 ✓
aws-c-cal     v0.5.12 ✓
aws-c-common    v0.6.17 -> v0.6.18
aws-c-compression v0.2.14 ✓
aws-c-event-stream v0.2.7 ✓
aws-c-http     v0.6.10 ✓
aws-c-io      v0.10.13 -> v0.10.14
aws-c-mqtt     v0.7.9 -> v0.7.10
aws-c-s3      v0.1.27 -> v0.1.30
aws-c-sdkutils   v0.1.1 ✓
aws-checksums   v0.1.12 ✓
aws-lc       v0.0.2 ✓
s2n        v1.3.0 -> v1.3.1

Diff:

Submodule crt/aws-c-common 4639b27..cba2308:
  > Support for Windows server 2008 (#868)
  > Bump Litani version to 1.16.0 (#872)
  > Upgrade CBMC submodules (#871)
  > Remove aws_ring_buffer_allocator_init declaration from public header (#870)
  > Make byte_buf proof allocator consistent with code (#869)
  > Removes unused stubs from CBMC proofs (#867)
Submodule crt/aws-c-io da95b34..cb9dcea:
  > const pointer (#456)
  > Set default cpu_id on thread_options (#455)
  > Windows header (#454)
  > Improved error reporting when getaddrinfo() fails (#452)
Submodule crt/aws-c-mqtt 60f9a17..6168e32:
  > remove try lock from debug build (#207)
Submodule crt/aws-c-s3 8655417..76f49fb:
  > Enable headers callback invocation for failed requests (#162)
  > remove try lock from debug build (#161)
  > [dashboard] update dependencies and tirvial bug fix (#160)
  > fix build for cross compile (#157)
  > Add missing dependency in README.md (#156)
  > Remove package locks irrelevant to aws-c-s3's security stance (#155)
  > Remove package locks irrelevant to aws-c-s3's security stance (#154)
Submodule crt/s2n ab9a3be..7d02417:
  > Nitpick usage guide links (#3133)
  > FIPS Static Config is Only Created When Needed (#3129)
  > Fix build on NetBSD. (#3131)
  > Feature probe for EVP_md5_sha1() (#3128)
  > Allow EVP hash implementation to use EVP_md5_sha1 if available (#3126)
  > Allow synchronous private key operations (#3121)

Author: Cesar Mello