… to v0.12.8 (#388)

)

* ENV vars for OPENSSL_NO_ASM

* Fix CI checks

* hkdf: increase MAX_HKDF_INFO_LEN

Encrypted client hello (ECH) offer confirmation requires computing an 8 byte
confirmation value:

```
   accept_confirmation = HKDF-Expand-Label(
      HKDF-Extract(0, ClientHelloInner.random),
      "ech accept confirmation",
      transcript_ech_conf,
      8)
```

Similarly, in the hello-retry request confirmation case we compute:
```
   hrr_accept_confirmation = HKDF-Expand-Label(
      HKDF-Extract(0, ClientHelloInner1.random),
      "hrr ech accept confirmation",
      transcript_hrr_ech_conf,
      8)
```

The HKDF-Expand-Label and HKDF-Extract algorithms are unmodified from RFC 8446.

For a handshake using SHA-384, or SHA-512, as the digest algorithm it's
possible for the `info` parameter to the HKDF expand step to exceed 80
bytes.

```
  2 bytes for the output len
  1 byte for the label len
  6 bytes for the label prefix
 23 bytes for the ECH confirmation label (or 27 for HRR)
  1 byte for the context len
 48 bytes for the context (SHA-384), or 64 bytes (SHA-512)
------------------------------------------
= 81 or 97 bytes total, SHA-384, non-hrr
= 85 or 101 bytes total, SHA-512, hrr

Both would exceed the existing `MAX_HKDF_INFO_LEN` limit of 80 bytes,
and so produce `Unspecified` errors.

This commit increase the limit to 102 bytes (it seemed a nicer value
than 101), allowing the use of aws-lc-rs HKDF for ECH confirmation
purposes without panic.

* Improve docs on 'Prk::expand' errors

---------

Co-authored-by: Justin Smith <justsmth@amazon.com>

* Updates for User Guide

* Note about AWS_LC_SYS_NO_ASM

* Satisfy clippy

* Per PR feedback

* Update to AWS-LC 1.26.0

* Symbols from ubuntu-latest

* Symbols from macos-13-xlarge

* Symbols for aarch64-unknown-linux-gnu

* Symbols for x86_64-unknown-linux-musl

* Symbols for aarch64-unknown-linux-musl

* Symbols for i686-unknown-linux-gnu

* Symbols from macos-12

* Generated headers

* Generated bindings from macos-13-xlarge

* Generated bindings from ubuntu-latest

* Generated bindings for aarch64-unknown-linux-gnu

* Generated bindings for i686-unknown-linux-gnu

* Generated bindings for aarch64-unknown-linux-musl

* Generated bindings for x86_64-unknown-linux-musl

* Generated bindings from macos-12

* Collected source files for x86_64-unknown-linux-musl

* Collected source files from macos-13-xlarge

* Collected source files from ubuntu-latest

* Collected source files from macos-12

* Collected source files for i686-unknown-linux-gnu

* Collected source files for aarch64-unknown-linux-gnu

* Collected source files for aarch64-unknown-linux-musl

---------

Co-authored-by: aws-lc-sys-bindings-generator <aws-lc-github-bot@amazon.com>

* Perform release build when cross-compiling

* Also build/test with dev profile