chore(release): change PackageReference of MPL (#654)

fix(ESDK): Head Auth logic and HKDF's info parameter (#621)

The ESDK-NET’s Message Header AAD
incorrectly appended two empty bytes
when using the DefaultCMM.
The HKDF invocation of non-committing algorithm suites
failed to include the Message ID in the info parameter.

Neither of these issues 
effect the security of messages 
written by the 4.0.0 release.

However, 
these messages diverge 
from the Encryption SDK Message Specification.
Thus:

* ESDK-NET v4.0.0 writes messages that only ESDK-NET v4.0.0 and greater can read.
* ESDK-NET v4.0.0 is ONLY able to read messages that are written by ESDK-NET v4.0.0

These issues are fixed in 4.0.1, 
which writes messages according to the Encryption SDK Message Specification,
and are interoperable with other implementations of this library.

The option NetV4_RetryPolicy can be use to decrypt v4.0.0 messages.
See AwsEncryptionSDK/runtimes/net/Examples/NetV4_0_0Example.cs on how to use the NetV4_RetryPolicy
and details on distributed applications.

chore(.NET): update .Net Examples (#230)

Co-authored-by: Lucas McDonald <[email protected]>
Co-authored-by: Tony Knapp <[email protected]>

chore: update version and changelog for v3.1.0 (#603)

fix: release-prod buildspec quoting (#584)