Fix "ERROR [launcher.sauce]: Can not start safari latest"

This commit addresses the following error in the Action Cable integration test:

https://buildkite.com/rails/rails/builds/118358#01969a38-6324-4e5f-9ced-bff4b8b87599

```
04 05 2025 07:36:27.081:ERROR [launcher.sauce]: Can not start safari latest
... snip ...
UnsupportedPlatform - no images found for the specified caps
```

According to https://saucelabs.com/products/platform-configurator,
macOS Sonoma 14 is currently in beta on SauceLabs. Therefore, this change
uses macOS 13 Ventura and specifies Safari version 16, which is the default
Safari version for macOS 13 Ventura.

Author: yahonda

actioncable/karma.conf.js

@@ -25,7 +25,7 @@ if (process.env.CI) {
   config.customLaunchers = {
     sl_chrome: sauce("chrome", 70),
     sl_ff: sauce("firefox", 63),
-    sl_safari: sauce("safari", "latest"),
+    sl_safari: sauce("safari", "16", "macOS 13"),
     sl_edge: sauce("microsoftedge", 17.17134, "Windows 10"),
   }