RFR: 1943: Update .github/workflows/ci.yml to fix GHA

[Erik Joelsson]

On Mon, 12 Jun 2023 20:43:21 GMT, Zhao Song <zsong at openjdk.org> wrote:

> Since last month, the GitHub Action for running tests on macOS has been failing consistently, and the test job always failed due to time out. It seems like that GitHub no longer supports tests on macOS-10.15, so we need to update the configuration.

.github/workflows/ci.yml line 86:

> 84:   mac:
> 85:     name: macOS x64
> 86:     runs-on: "macos-latest"

We should still pick a specific version for reproducibility.

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PR Review Comment: https://git.openjdk.org/skara/pull/1530#discussion_r1227250426