obs websocket v5.1.0

[andreykaipov]

Guess there's no new stuff. Surprised there's no breaking changes!

For posterity, release process was as follows:

1. Bump goobs_version and obs_protocol_version in version.go
2. Bump the versions of the links in the README.md
3. Run make clean && make generate to pull in latest protocol changes
4. Ensure no tests are failing via make test, modifying internal/generate/tests/main.go if necessary
5. Double check the versions from step 1, and merge the PR in
6. Back on the main branch, pull in the latest changes and run make release
7. View and edit the release from the Web UI if necessary (I like to add the corresponding obs-websocket protocol version to the name of the release)

[andreykaipov]

Just realized I still missed some steps. The version of the server in the Docker image is still v5.0.0 lol