Upgrade to 1.76.0, remove buster, add bookworm

[Gredin67]

Problem

• Upgrade to 1.76.0
• remove buster support
• add bookworm support

Solution

• And how do you fix that problem

PR Status

• [ ] Code finished and ready to be reviewed/tested
• [ ] The fix/enhancement were manually tested (if applicable)

Automatic tests

Automatic tests can be triggered on https://ci-apps-dev.yunohost.org/ after creating the PR, by commenting "!testme", "!gogogadgetoci" or "By the power of systemd, I invoke The Great App CI to test this Pull Request!". (N.B. : for this to work you need to be a member of the Yunohost-Apps organization)

[Gredin67]

!testme

[yunohost-bot]

:sunflower:

[yunohost-bot]

Meow :cat2:

[Gredin67]

@Josue-T could you have a look at this, we are facing this bug https://github.com/matrix-org/synapse/pull/14669 And would need an upgrade to >=1.75