[secp256k1] Update macOS image for CI

Summary:
Backport of secp256k1#1152:
https://github.com/bitcoin-core/secp256k1/pull/1152/commits/c0ae48c9950a908b637bff27791fabbe2833c4a5

The second commit is not applicable.

Depends on D12960.

This will unbreak the build on Cirrus CI, following the MacOS Intel deprecation:
https://cirrus-ci.org/blog/2022/11/08/sunsetting-intel-macos-instances/

Test Plan:
See the CI result all green on my forked repo:
https://cirrus-ci.com/build/5534806579085312

Reviewers: #bitcoin_abc, sdulfari

Reviewed By: #bitcoin_abc, sdulfari

Differential Revision: https://reviews.bitcoinabc.org/D12961