ci: use of ubuntu 22.04

[muzarski]

Runner image regression (ubuntu-latest)

With recent update of ubuntu-latest pointing to ubuntu-24.04, multiple issues started to occur during CI. As a temporary measure, to make CI green again, let's keep on using ubuntu-22.04 (previously ubuntu-latest).

Scylla-ccm

We will now fetch most recent version of scylla-ccm (master) during CI

Opened an issue to update runners to ubuntu-latest in the future: https://github.com/scylladb/cpp-rust-driver/issues/192

Pre-review checklist

• [x] I have split my patch into logically separate commits.
• [x] All commit messages clearly explain what they change and why.
• [x] PR description sums up the changes and reasons why they should be introduced.
• ~[ ] I have implemented Rust unit tests for the features/changes introduced.~
• ~[ ] I have enabled appropriate tests in .github/workflows/build.yml in gtest_filter.~
• ~[ ] I have enabled appropriate tests in .github/workflows/cassandra.yml in gtest_filter.~