Add 5.7 toolchain matrix

[github-actions[bot]]

Time Change: -188ms (1%)

Total Time: 17,988ms

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import	22ms	+2ms (7%)	🔍

View Unchanged

| Test name | Duration | Change | | :--- | :---: | :---: | | Serialization/JavaScript function call through Wasm import with int | 19ms | -0ms | | Serialization/JavaScript function call from Swift | 193ms | -2ms (1%) | | Serialization/Swift Int to JavaScript with assignment | 440ms | +1ms (0%) | | Serialization/Swift Int to JavaScript with call | 1,359ms | -16ms (1%) | | Serialization/JavaScript Number to Swift Int | 466ms | -13ms (2%) | | Serialization/Swift String to JavaScript with assignment | 505ms | -7ms (1%) | | Serialization/Swift String to JavaScript with call | 1,455ms | -28ms (1%) | | Serialization/JavaScript String to Swift String | 5,672ms | -152ms (2%) | | Object heap/Increment and decrement RC | 7,841ms | +31ms (0%) |

View Baselines

| Test name | Duration | | :--- | :---: | | Serialization/Call JavaScript function directly | 4ms | | Serialization/Assign JavaScript number directly | 2ms | | Serialization/Call with JavaScript number directly | 3ms | | Serialization/Write JavaScript string directly | 3ms | | Serialization/Call with JavaScript string directly | 3ms |