fix(ci): use macos-15-intel for x86_64 builds

macos-13 is deprecated, use macos-15-intel instead.

Author: oae

.github/workflows/release.yml

@@ -40,7 +40,7 @@ jobs:
             goos: linux
             goarch: arm64
             suffix: ""
-          - os: macos-13
+          - os: macos-15-intel
             goos: darwin
             goarch: amd64
             suffix: ""