Update version to v1.6.0

[justsmth]

Highlights

• AES Key Wrap Algorithm Support by @skmcgrail in https://github.com/aws/aws-lc-rs/pull/250
• Expose accessors for private/public key on elliptic curve keys by @justsmth in https://github.com/aws/aws-lc-rs/pull/259
• KEM: Key-Encapsulation Mechanisms API Support by @skmcgrail in https://github.com/aws/aws-lc-rs/pull/260
• RSA Module Refactor by @skmcgrail in https://github.com/aws/aws-lc-rs/pull/273
• Support for PowerPC big-endian by @justsmth in https://github.com/aws/aws-lc-rs/pull/295
• Persistent private keys for agreement by @justsmth in https://github.com/aws/aws-lc-rs/pull/302
• A working FIPS build for Windows by @justsmth in https://github.com/aws/aws-lc-rs/pull/309
• RSA Key Generation Support by @skmcgrail in https://github.com/aws/aws-lc-rs/pull/315

Other Changes

• Update rustls integration test by @skmcgrail in https://github.com/aws/aws-lc-rs/pull/291
• CI for minimal dependency versions by @justsmth in https://github.com/aws/aws-lc-rs/pull/290
• Enable exhaustive_enums lint by @skmcgrail in https://github.com/aws/aws-lc-rs/pull/289
• Move hex functions out of test mod by @justsmth in https://github.com/aws/aws-lc-rs/pull/293
• Updated aws-lc-fips-sys and fips feature messaging by @skmcgrail in https://github.com/aws/aws-lc-rs/pull/282
• Consider target env for pregenerated bindings by @justsmth in https://github.com/aws/aws-lc-rs/pull/283
• Set debug for CMAKE_BUILD_TYPE by @justsmth in https://github.com/aws/aws-lc-rs/pull/298
• Improve support for big/little-endian arrays by @justsmth in https://github.com/aws/aws-lc-rs/pull/299
• Use classic comment style for CMakelists copyright notice by @WesleyRosenblum in https://github.com/aws/aws-lc-rs/pull/304
• Refactor sys-crate Cmake build logic by @justsmth in https://github.com/aws/aws-lc-rs/pull/301
• RSA Module Tidying by @skmcgrail in https://github.com/aws/aws-lc-rs/pull/305
• Fix script nightly feature by @skmcgrail in https://github.com/aws/aws-lc-rs/pull/307
• Migrate actions-rs/* to dtolnay/rust-toolchain by @skmcgrail in https://github.com/aws/aws-lc-rs/pull/308
• Add CI test with musl by @justsmth in https://github.com/aws/aws-lc-rs/pull/310
• Update to AWS-LC-FIPS-2.0.5 by @justsmth in https://github.com/aws/aws-lc-rs/pull/313
• Update bindgen requirement from 0.68.1 to 0.69.2 by @dependabot in https://github.com/aws/aws-lc-rs/pull/311
• Update aws-lc-sys/aws-lc to v1.20.0 by @skmcgrail in https://github.com/aws/aws-lc-rs/pull/314
• Use cargo-careful w/ CI tests by @justsmth in https://github.com/aws/aws-lc-rs/pull/312
• Split CI configuration across multiple files by @justsmth in https://github.com/aws/aws-lc-rs/pull/316
• Update to latest FIPS-2.0.6 by @justsmth in https://github.com/aws/aws-lc-rs/pull/318
• Rust Docs + GH workflow cleanup by @justsmth in https://github.com/aws/aws-lc-rs/pull/320
• Minor adjustments to key_wrap module API by @skmcgrail in https://github.com/aws/aws-lc-rs/pull/321
• Fix GH doc deploy by @justsmth in https://github.com/aws/aws-lc-rs/pull/323
• Encoding docs cleanup by @justsmth in https://github.com/aws/aws-lc-rs/pull/319
• Fix doc deploy 2 by @justsmth in https://github.com/aws/aws-lc-rs/pull/324

New Contributors

• @WesleyRosenblum made their first contribution in https://github.com/aws/aws-lc-rs/pull/304

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (75a5a1c) 95.82% compared to head (3910d40) 95.82%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #322 +/- ## ======================================= Coverage 95.82% 95.82% ======================================= Files 62 62 Lines 8025 8025 ======================================= Hits 7690 7690 Misses 335 335 ```

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