Run clang-format with updated Ubuntu image

[ranisalt]

Pull Request Prelude

• [x] I have followed proper The Forgotten Server code styling.
• [x] I have read and understood the contribution guidelines before making this PR.
• [x] I am aware that this PR may be closed if the above-mentioned criteria are not fulfilled.

Changes Proposed

After #4654 the prehistoric Ubuntu used by Github Actions runs clang-format 4 major versions outdated and fails to accept the formatted files. This is an attempt to run a more up-to-date version of Ubuntu and not have this issue.