Bump macos version in wheels gha workflow (#12882)

During the 1.2.0rc1 release process we had a failure to build the x86_64
macOS jobs. This was because the job was still trying to use the
macos-11 runner which is no longer supported. [1] This commit fixes this
by bumping the version in the wheel job to macos-12.

[1] https://github.blog/changelog/2024-05-20-actions-upcoming-changes-to-github-hosted-macos-runners/

.github/workflows/wheels.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-11, windows-latest, macos-14]
+        os: [ubuntu-latest, macos-12, windows-latest, macos-14]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
@@ -47,7 +47,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-11]
+        os: [macos-12]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5