website/integrations: Updates for Apache Guacamole 1.6

[cheggerdev]

Do you see an area that can be clarified or expanded, a technical inaccuracy, or a broken link? Please describe.
The current description works with Apache Guacamole up to version 1.5.5.
Minor adjustments are needed for version 1.6.0.
https://guacamole.apache.org/doc/gug/openid-auth.html

Provide the URL or link to the exact page in the documentation to which you are referring.
https://integrations.goauthentik.io/infrastructure/apache-guacamole/

Describe the solution you'd like
Add the settings needed for version 1.6.0:

Section "Apache Guacamole Configuration":

For Docker-Configuration to enable the openid extension:

- OPENID_ENABLED=true

Add one of these:

(Automatically redirecting all unauthenticated users)

- EXTENSION_PRIORITY=openid     

(Presenting unauthenticated users with a login screen)

- EXTENSION_PRIORITY=*,openid   

The cacert path has been changed:

Version 1.5.5: /opt/java/openjdk/jre/lib/security/cacerts
Version 1.6.0: /opt/java/openjdk/lib/security/cacerts