OIDC OP v4.1.0 now available

[Henri Mikkonen]

The Shibboleth Project has released V4.1.0 of the OIDC OP plugin (see 
release notes at [1])

This is a feature release that adds support for OIDC logout along with 
some general improvements and minor bug fixes.

Acknowledgement to DAASI: their back-channel logout propagation plugin 
was used as a basis for the logout feature implementation.

-- Henri Mikkonen, on behalf of the team

[1] 
https://shibboleth.atlassian.net/wiki/spaces/IDPPLUGINS/pages/2776760321/OPReleaseNotes