chore: drop test-generator dev-dependency

I want to move the test_html5lib integration test to a separate crate
so that it can properly depend on the integration-tests feature in a way
so that `cargo test` just works and runs the integration test.
(Currently `cargo test` fails since test_html5lib depends on that feature.)

However test_html5lib currently depends on the test-generator crate
and test-generator doesn't support Cargo workspaces[1] and appears to
be unmaintained.

This commit therefore drops the test-generator dev-dependency.

[1]: https://github.com/frehberg/test-generator/issues/6

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