RFR: 8313428: GHA: Bump GCC versions for July 2023 updates

[Aleksey Shipilev]

On Mon, 31 Jul 2023 18:17:03 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Some GHA runs are now running into configuration problems after runner update. We need to bump the GCC versions to unbreak them. 
> 
> Additional testing:
>  - [x] GHA

Note that RISC-V cross-build still fails due to bootstrapping errors, and should be fixed separately.

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PR Comment: https://git.openjdk.org/jdk/pull/15093#issuecomment-1659754406