The Jamulus build system runs with an unsupported clang format version

[pljones]

Describe the bug

The Jamulus build system runs with an unsupported clang format version:

Run DoozyX/clang-format-lint-action@c3b2c943e924028b93a707a5b1b017976ab8d50c
  with:
    clangFormatVersion: 10

Ubuntu only provides apt with 11 to 15:

$ sudo apt install clang-format<TAB><TAB>
clang-format     clang-format-11  clang-format-12  clang-format-13  clang-format-14  clang-format-15

(https://apt.llvm.org/ only provides 15 and newer.)

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.2 LTS
Release:        22.04
Codename:       jammy

To Reproduce

Install and use the earliest supported clang-format version:

$ clang-format --version
Ubuntu clang-format version 11.1.0-6
$ make clang_format
...
$ git diff
(nothing changed)
$ git status
Your branch is up-to-date with 'origin/bugfix/#2723-self-label-checkboxes-forms1'.

Run "Verify coding style" on https://github.com/pljones/jamulus/tree/bugfix/remove-remaining-directory-server-mentions
https://github.com/jamulussoftware/jamulus/actions/runs/4270698669/jobs/7435420804
https://github.com/jamulussoftware/jamulus/actions/runs/4270698669/attempts/1

Expected behavior

Consistent clang format behaviour with at least clang-format-11 (but, given https://apt.llvm.org/, I'd suggest getting onto 15 as soon as we can).

Screenshots

n/a

Operating system

Github build system on Linux.

Version of Jamulus

n/a

Additional context

Blocking #3017

[ann0see]

I'm not sure if there's still a reason for the old clang format version.
Even Debian Stable uses clang format 11.

[ann0see]

Related to: #2552 (at least somehow).

[ann0see]

I'll give my ok updating clang-format. Feel free to open a PR and request a review from me. Note that I'm somewhat busy at the moment.