RFR: 8293107: GHA: Bump to Ubuntu 22.04

[Magnus Ihse Bursie]

On Wed, 31 Aug 2022 06:21:22 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> WIP, depends on #10083.
>> 
>> At this point, we can switch to Ubuntu 22.04 as the base for GHA runners. GHA would switch `ubuntu-latest` soon:
>>  https://github.blog/changelog/2022-08-09-github-actions-ubuntu-22-04-is-now-generally-available-on-github-hosted-runners/
>> 
>> This gives us several benefits:
>>   - we can expect that the availability of 20.04 runners would decline in future, while 22.04 enabled runners would become more available;
>>   - toolchains would now include GCC 11;
>>   - RISC-V cross-builds would become available; 
>> 
>> Additional testing:
>>  - [ ] GHA
>
> I realized some ports still not able to build cleanly with GCC 11, so I retracted that bit from this PR, leaving only the update to Ubuntu version. We can switch to GCC 11 separately.

@shipilev Nevermind, I just noticed https://github.com/openjdk/jdk/pull/10099. :)

-------------

PR: https://git.openjdk.org/jdk/pull/10084