RFR: 8293107: GHA: Bump to Ubuntu 22.04 / GCC 11

[Aleksey Shipilev]

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

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

Depends on: https://git.openjdk.org/jdk/pull/10083

Commit messages:
 - Switch to Ubuntu 22.04 / GCC 11

Changes: https://git.openjdk.org/jdk/pull/10084/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10084&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293107
  Stats: 21 lines in 3 files changed: 0 ins; 0 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/10084.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10084/head:pull/10084

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