[jdk21u] RFR: 8313428: GHA: Bump GCC versions for July 2023 updates

[Aleksey Shipilev]

On Wed, 2 Aug 2023 08:35:59 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean backport to unbreak GHA.
> 
> Additional testing:
>  - [x] GHA

RISC-V GHA builds fail due to infrastructure problem. Push approval is here.

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PR Comment: https://git.openjdk.org/jdk21u/pull/33#issuecomment-1664205645