Where is a certain version of the protocol?

I'm using these definitions to generate a C# wrapper for all its defined API. The current master version does not work with the current Chrome stable version 87 because the PDL requires a member that isn't provided by the actual browser. That member was added on 4 Nov but the browser was released on 19 Nov. So it seems like the browser doesn't use the latest PDL when released. A really old version from 2 years ago works for me (and has worked the last 2 years), but I cannot tell its version, it was still fetched from another GitHub repository that no longer contains these PDL files. Google search brought me here instead.

I guess I'm better off using the stable version 1.3 that is described in the referenced protocol viewer. But I cannot find any version specifications in this repository. There are random branch names and version tags but nothing that looks like Chrome versions or 1.2 or 1.3. All I see is 6-digit numbers starting with 7 or 8 that have no meaning to me.

Where can I find the right commit in this repository?

Review the repository's version tags and branch names alongside the Chrome 87 timing described in the issue, and check the referenced protocol viewer. Done when the repository identifies how its commits or tags correspond to Chrome and protocol versions, including where to find the matching PDL version.