Bug#1135954: Depends: python3 (>= 3.14~) is unresolvable on Debian sid

[Bastian Germann]

Package: python3-av
Version: 17.0.1+ds-1
Severity: grave
Justification: renders package unusable

I can work around the issue (which is probably in generating the substvars)
by Build-Depending on python3-dev instead of python3-all-dev.