Upgrade Shibboleth IDP version

[uprightech]

Synopsis

This ticket will be used to track each upgrade to a new version of Shibboleth IDP for oxShibboleth.

Upgrade Procedure

The upgrade procedure will

1. Check the [Shibboleth v4 IDP Pages] (https://shibboleth.atlassian.net/wiki/spaces/IDP4/overview) or
   the shibboleth-announce mailing list for new releases.
2. If a new release is found , create a new comment under this issue. The format of which will be specified below
3. Perform the upgrade. referencing every commit related to this issue wherever possible.
4. Edit the comment above if necessary to document the changes and the areas affected by it. E.g. changes to be
   made to the documentation.
5. Repeat from the first step.

Upgrade Comment Template

In this section we will provide a template for the github comment described in the upgrade procedure above. It's important
said comment contains all of the necessary information, especially for the purpose of documentation. The template will be
provided in markdown format. This template is subject to change.

### Upgrade to Shibboleth IDP version <shib_version>. Release date: <shib_release_date> 
 - version: `<version>`
 - sha256 hash: `<shibboleth hash>`
 - 


### Changelog

 Document the areas and features affected by the upgrade. They will be presented as bullet points. 
 An example of bullet point item would be 
 - `Added p:postAuthenticationFlows` to `relying-party.xml`