mopidy: pin setuptools<80 (pkg_resources removed in setuptools 80+)

setuptools 80+ removed pkg_resources module. Mopidy imports pkg_resources
at startup, so we need a version that still bundles it.

infra/mopidy/Dockerfile

@@ -16,7 +16,7 @@ RUN apt-get update \
  && rm -rf /var/lib/apt/lists/*
 
 RUN pip install --no-cache-dir \
-    setuptools \
+    "setuptools<80" \
     Mopidy==3.4.2 \
     Mopidy-Qobuz \
     Mopidy-Local