Cargo: avoid unused aws-lc-rs default features

[cpu]

The aws-lc-rs crate defaults to enabling the ring-io and ring-sig-verify features, but we use neither in this crate. Avoiding these features is beneficial because it prevents the inclusion of a second copy of untrusted in the dependency tree.

You can see the presence of the extra untrusted 0.7.1 in cargo tree --no-default-features --features=aws_lc_rs before/after this change:

Cargo tree output from `main` prior to this change:

rustls-webpki v0.102.1 (/home/daniel/Code/Rust/webpki)
├── aws-lc-rs v1.6.1
│   ├── aws-lc-sys v0.13.0
│   │   ├── libc v0.2.150
│   │   └── paste v1.0.14 (proc-macro)
│   │   [build-dependencies]
│   │   ├── cmake v0.1.50
│   │   │   └── cc v1.0.83
│   │   │       └── libc v0.2.150
│   │   ├── dunce v1.0.4
│   │   └── fs_extra v1.3.0
│   ├── mirai-annotations v1.12.0
│   ├── paste v1.0.14 (proc-macro)
│   ├── untrusted v0.7.1
│   └── zeroize v1.7.0
├── rustls-pki-types v1.1.0
└── untrusted v0.9.0

Cargo tree output from this branch:

rustls-webpki v0.102.1 (/home/daniel/Code/Rust/webpki)
├── aws-lc-rs v1.6.1
│   ├── aws-lc-sys v0.13.0
│   │   ├── libc v0.2.150
│   │   └── paste v1.0.14 (proc-macro)
│   │   [build-dependencies]
│   │   ├── cmake v0.1.50
│   │   │   └── cc v1.0.83
│   │   │       └── libc v0.2.150
│   │   ├── dunce v1.0.4
│   │   └── fs_extra v1.3.0
│   ├── mirai-annotations v1.12.0
│   ├── paste v1.0.14 (proc-macro)
│   └── zeroize v1.7.0
├── rustls-pki-types v1.1.0
└── untrusted v0.9.0

Related: rustls/rustls#1768

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4d1ecc2) 97.18% compared to head (bc629f4) 97.18%.

❗ Current head bc629f4 differs from pull request most recent head 1df3dcb. Consider uploading reports for the commit 1df3dcb to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #224   +/-   ##
=======================================
  Coverage   97.18%   97.18%           
=======================================
  Files          19       19           
  Lines        4299     4299           
=======================================
  Hits         4178     4178           
  Misses        121      121           

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[djc]

Do we need to bump the version requirement in order to disable these features?

[cpu]

Do we need to bump the version requirement in order to disable these features?

I don't think so. I think the reason the min version had to be bumped previously in the Rustls repo was from using unrelated new functionality.

[djc]

So there's no reason to bump it here, right?