CI: disable linkcheck for https://superuser.com

[hagenw]

Disables linkchecking for the permalink https://superuser.com/a/264406, which should anyway never break.

[codecov]

Codecov Report

Merging #327 (80a34aa) into main (e2a3231) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is 100.0%.

Files Changed	Coverage Δ
audb/core/conftest.py	100.0% <ø> (ø)
audb/core/flavor.py	100.0% <ø> (ø)
audb/core/publish.py	100.0% <ø> (ø)
audb/__init__.py	100.0% <100.0%> (ø)
audb/core/api.py	100.0% <100.0%> (ø)
audb/core/config.py	100.0% <100.0%> (ø)
audb/core/dependencies.py	100.0% <100.0%> (ø)
audb/core/info.py	100.0% <100.0%> (ø)
audb/core/load.py	100.0% <100.0%> (ø)
audb/core/load_to.py	100.0% <100.0%> (ø)
... and 1 more