Coturn update 4.5.2 -> 4.5.2-r2

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1131

The new one is based on Alpine 3.14, instead of Alpine 3.13.

Add support for CentOS (Stream) 8

according to discussion in channel not needed anymore

Content-Security-Policy For Element Web

Update grafana 8.0.2 -> 8.0.3

https://github.com/vector-im/element-web#configuration-best-practices

Should have been part of 9daeb39710

Update configuring-playbook-synapse.md

Added an example for configuring the variables for the OpenID, that might fails because the variables are not defined for the playbook parsing, but Synapse's own config file parsing.

GoMatrixHosting v0.5.0

update hydrogen v0.1.56 -> v0.1.57

Update grafana 8.0.0 -> 8.0.2

https://github.com/vector-im/hydrogen-web/releases/tag/v0.1.57

Add ability to configure jitsi-prosody to load custom modules

coturn update

Update grafana 7.5.7 -> 8.0.0

Update element 1.7.29 -> 1.7.30

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1108