Re: [PATCH] ci: update 'static-analysis' to Ubuntu 22.04

> From: Derrick Stolee <derrickstolee@github.com>
>
> GitHub Actions scheduled a brownout of Ubuntu 18.04, which canceled all
> runs of the 'static-analysis' job in our CI runs. Update to 22.04 to
> avoid this as the brownout later turns into a complete deprecation.
>
> The use of 18.04 was set in d051ed77ee6 (.github/workflows/main.yml: run
> static-analysis on bionic, 2021-02-08) due to the lack of Coccinelle
> being available on 20.04 (which continues today).
>
> Signed-off-by: Derrick Stolee <derrickstolee@github.com>
> ---
>     ci: update 'static-analysis' to Ubuntu 20.04
>     
>     I noticed this while preparing my bundle URIs series. See an example
>     cancellation at [1]
>     
>     [1]
>     https://github.com/gitgitgadget/git/runs/7954913465?check_suite_focus=true
>     
>     I initially asked about this [2]. Thanks to Matthias Aßhauer for
>     pointing out that 22.04 has Coccinelle available [3].