ci: pin GitHub Actions macos runner version and build for darwin/amd64 #10170

Job	Run time	Billable time
Generate Code	1m 5s	0s
YAML Lint	16s	0s
Go Lint	1m 45s	0s
Rego PR checks	1m 23s	0s
Go Test (linux)	4m 44s	0s
Check Generated	30s	0s
Go compat build/test (ubuntu-22.04, 1.20)	3m 12s	0s
Go Test (darwin)	4m 29s	0s
Go Build (linux amd64)	2m 37s	0s
Go compat build/test (macos-14, 1.20)	3m 28s	0s
Go Build (linux arm64)	2m 16s	0s
Go Build (linux arm64GO_TAGS="-tags=opa_no_oci")	2m 3s	0s
Go Race Detector	6m 13s	0s
WASM	8s	0s
Go Build (windows amd64)	2m 28s	0s
Go Build (darwin amd64)	1m 32s	0s
Go Build (darwin arm64)	54s	0s
docker image smoke test	46s	0s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64, amd64)	12s	0s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64_static, amd64, disabled)	41s	0s
smoke-test-binaries (darwin, macos-13, opa_darwin_amd64, amd64)	25s	0s
smoke-test-binaries (darwin, macos-14, opa_darwin_arm64_static, arm64, disabled)	18s	0s
smoke-test-binaries (windows, windows-latest, opa_windows_amd64.exe, amd64)	34s	0s
	41m 59s	0s

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