git: openjdk/jdk11u-dev: 8340671: GHA: Bump macOS and Xcode versions to macos-12 and XCode 13.4.1

[Severin Gehwolf]

Changeset: dd35f187
Branch: master
Author:    Antonio <antonio at vieiro.net>
Committer: Severin Gehwolf <sgehwolf at openjdk.org>
Date:      2024-09-26 08:31:17 +0000
URL:       https://git.openjdk.org/jdk11u-dev/commit/dd35f187fd038281ce36b986ef71d3b813c0a83e

8340671: GHA: Bump macOS and Xcode versions to macos-12 and XCode 13.4.1

Reviewed-by: sgehwolf

! .github/workflows/build-macos.yml
! .github/workflows/main.yml
! .github/workflows/test.yml