Add explicit dependency on webrick
We depend on webrick as a Rack test server backend in integration specs.
However, we do not define this dependency anywhere. This means that whatever webrick version happens to be installed on client machines will be pulled in.
I pinned the version to 1.7.0 or above, which resolves a deprecation warning that was issued under Ruby 3 and tests are passing, so should good.
Edited by Matthias Käppler