15.9.0-canary.24

Patches

• [now dev] Update outdated dependencies in tests: #2666
• [now dev] Bundle canary builders for Now CLI canary: #2661
• [now dev] Update NOW_BUILDER_DEBUG base on --debug flag: #2655
• [CircleCI] Add more test suites for macOS support: #2663
• Bump yarn to v1.17.3: #2669
• [now deploy] Check server.js file when detecting the platform version: #2664

Credits

Huge thanks to @TooTallNate and @Sophearak for helping!