ci: update macOS runners from deprecated macos-13 to macos-15

GitHub is retiring macos-13 runners. Update cargo-dist config to use
macos-15 for Intel and macos-latest for ARM builds.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: domenkozar

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+- CI: Updated macOS runners from deprecated macos-13 to macos-15 (Intel) and macos-latest (ARM)
+
 ## [0.5.0] - 2026-01-02
 
 ### Added

dist-workspace.toml

@@ -25,3 +25,5 @@ libdbus-1-dev = { version = "*", targets = [
 # https://github.com/axodotdev/cargo-dist/issues/74
 [dist.github-custom-runners]
 aarch64-unknown-linux-gnu = "ubuntu-24.04-arm"
+aarch64-apple-darwin = "macos-latest"
+x86_64-apple-darwin = "macos-15"