Go: add fasthttp to frameworks for coverage

[owen-mc]

Models-as data models for the new framework fasthttp were added in this PR. This PR adds it to the list of frameworks for the models-as-data coverage report.

[github-actions]

⚠️ The head of this PR and the base branch were compared for differences in the framework coverage reports. The generated reports are available in the artifacts of this workflow run. The differences will be picked up by the nightly job after the PR gets merged.

Click to show differences in coverage

go

Generated file changes for go

• Changes to framework-coverage-go.rst:

+    `fasthttp <https://github.com/valyala/fasthttp>`_,``github.com/valyala/fasthttp*``,,5,
-    Others,``github.com/valyala/fasthttp``,,5,

[owen-mc]

(To be clear, in the second commit I have run the script to update the frameworks reports myself, though it would have been picked up automatically by a nightly job. I think next time I'll leave it for the nightly job to avoid having to find the script and guess how to run it.)

[mbg]

Looks reasonable