[jdk19u] RFR: 8290000: Bump macOS GitHub actions to macOS 11

[George Adams]

On Tue, 19 Jul 2022 07:30:33 GMT, George Adams <duke at openjdk.org> wrote:

> macOS 10.15 has been deprecated for some time and will be removed completely on August 30th. See https://github.com/actions/virtual-environments#available-environments and https://github.com/actions/virtual-environments/issues/5583 for context.

Test failure is unrelated

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PR: https://git.openjdk.org/jdk19u/pull/8