[tpm2] [RELEASE] tpm2-abrmd 2.4.1

Hello,

Version 2.4.1 has been tagged and a release posted to github:

https://github.com/tpm2-software/tpm2-abrmd/releases/tag/2.4.1

This is a bugfix release. The CHANGELOG entry is:
### Added
   - Contributor Covenant Code of Conduct.

### Fixed
   - superflous warning messages about tcti status.
     - `WARNING **: 11:00:56.205: tcti_conf before: "(null)"`
     - `WARNING **: 11:00:56.205: tcti_conf after: "mssim"`
   - GCC 11 build error: error: argument 2 of `__atomic_load’ discards 
‘volatile’ qualifier`
   - Initialize gerror pointer variable to NULL to fix use of 
unitialized memory and segfault.
   - Updated missing defaults in manpage.
   - Port CI to composite actions in tpm2-software/ci.

### Removed
   - Dependency on 'which' utility in configure.ac.
   - ubuntu-16.04 from CI.

Best,
Philip