fix: win is indefined

[bertrand-sifre]

In some cases, 'win' can be undefined. I fixed this by using optional chaining.

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[GarholAviva]

This might have introduced a bug although it may be my configuration.
Since upgrading I now see:

Error: Webpack Compilation Error
./node_modules/@cypress/code-coverage/support.js 70:44
Module parse failed: Unexpected token (70:44)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
|     const saveCoverageObject = (win) => {
|       // if application code has been instrumented, the app iframe "window" has an object
>       const applicationSourceCoverage = win?.__coverage__
|       if (!applicationSourceCoverage) {
|         return

[KyDenZ]

I encountered the same error.
I had to update Cypress to a version higher than 12.17.4